What makes the chlorothalonil triple enforcement vacuum (OSHA no chemical-specific PEL + NIOSH no chemical-specific REL + no NIOSH Ca) qualitatively more severe than the captan NIOSH Ca no-REL vacuum — and why does PNOR 5 mg/m³ as the sole operative compliance threshold for an ACGIH A2 Suspected Human Carcinogen create the most complete federal regulatory gap in the Glyphward fungicide portfolio?

The chlorothalonil triple enforcement vacuum is structurally more severe than any other enforcement gap in the Glyphward fungicide portfolio because it is the only major fungicide for which neither OSHA nor NIOSH has established any chemical-specific limit — not even a Ca carcinogen designation. For captan (attack #359), NIOSH has established a Ca (potential occupational carcinogen) designation in the NIOSH Pocket Guide, which means NIOSH has at least acknowledged carcinogenicity at the federal level, signaling that exposures should be minimized; the captan NIOSH Ca failure is that this designation lacks a numerical REL. For chlorothalonil, NIOSH has not established a chemical-specific REL, has not published a Criteria Document for chlorothalonil, and does not carry a NIOSH Ca notation for chlorothalonil in the current NIOSH Pocket Guide. OSHA similarly has no chemical-specific PEL for chlorothalonil in Table Z-1, Table Z-2, or any substance-specific standard. The only operative federal occupational compliance thresholds are the non-specific PNOR (Particulates Not Otherwise Regulated) limits: 15 mg/m³ TWA total dust and 5 mg/m³ TWA respirable fraction — generic backstops for inert particulate nuisance dust, not carcinogen-aware, calibrated for particle mass without regard to the kidney cortical tubular carcinogenesis that underlies the ACGIH A2 TLV. An AI EHS platform querying OSHA and NIOSH for chlorothalonil receives PNOR 5 mg/m³ as the highest-priority federal threshold — 50× above ACGIH's carcinogen-specific advisory. A worker at 0.50 mg/m³ (5× the ACGIH A2 advisory; EPA Likely Carcinogenic to Humans) is reported as '10% of PNOR — within limit' without any chemical-specific OSHA or NIOSH flag. After ÷10 perturbation to 0.050 mg/m³, the output is '1.0% of PNOR — within limit' — communicating extraordinary safety margin for a worker chronically exposed to 5× the only carcinogen-specific advisory for a kidney carcinogen. The EU regulatory action provides independent context: EU Implementing Regulation 2019/168 (effective 20 May 2020) declined to renew chlorothalonil approval across EU member states based on concerns about the groundwater metabolite R471811 and endocrine disruption properties — the EU determined that chlorothalonil's risk profile warranted complete market withdrawal, while US PNOR continues to generate 'within limit' outputs at exposures that are 5× the ACGIH A2 advisory for an EPA-classified kidney carcinogen.

How does the chlorothalonil GSH-conjugate kidney bioactivation pathway (4-OH-CTC-GSH → OAT proximal tubule S3 → γ-glutamyltransferase + CCBL β-lyase → epithane thiol) explain the kidney cortical tubular adenoma and carcinoma in male F344 rats that underlies the EPA IRIS Likely Carcinogenic to Humans classification — and why does the SKIN notation create a dual inhalation + dermal systemic dose pathway that makes actual kidney exposure higher than inhalation TWA monitoring alone captures?

Chlorothalonil (tetrachloroisophthalonitrile; C₈Cl₄N₂; MW 265.91; CAS 1897-45-6) is a highly chlorinated aromatic dinitrile. The four chlorine atoms at positions 2, 4, 5, and 6 of the isophthalonitrile ring, activated by the electron-withdrawing nitrile groups at positions 1 and 3, make chlorothalonil a potent electrophile susceptible to nucleophilic aromatic substitution (SNAr). Bioactivation begins with GSH conjugation: cellular glutathione (GSH; MW 307; intracellular concentration 1–10 mM) acts as nucleophile at the para-position (position 4), displacing chlorine via SNAr to form 4-hydroxy-2,5,6-trichloroisophthalonitrile-1-glutathione conjugate (4-OH-CTC-GSH). This GSH conjugate is formed in hepatocytes during first-pass metabolism and released into portal circulation. The renal transport step is critical: 4-OH-CTC-GSH is a substrate for organic anion transporters OAT1 (SLC22A6) and OAT3 (SLC22A8) on the basolateral membrane of proximal tubule S3 segment cells. OAT-mediated active transport concentrates the GSH conjugate selectively in the S3 segment — explaining the kidney target organ specificity of chlorothalonil carcinogenesis. Within S3 cells, the mercapturic acid pathway enzymes cleave the GSH: γ-glutamyltransferase (GGT; brush border membrane) removes the glutamyl group; cysteinylglycinase removes glycine to form the cysteine conjugate (CTC-cys). CCBL (cysteine conjugate β-lyase; kynurenine aminotransferase; cytosolic and mitochondrial isoforms in renal proximal tubule) catalyzes β-elimination to release the reactive thiolate — a reactive epithane thiol (thiirane; episulfide) formed by intramolecular cyclization of the thiolate with a vicinal chlorine-bearing carbon. This epithane thiol alkylates protein thiols, DNA N7-guanyl positions, and lysine amino groups in S3 tubular cells, generating cytotoxicity at high doses (tubular necrosis) and mutagenesis/carcinogenesis at lower chronic doses (adenoma → carcinoma). EPA IRIS (2009 classification) concluded Likely Carcinogenic to Humans based on kidney cortical tubular adenoma and carcinoma in male F344 rats at dietary doses ≥1.8 mg/kg/day and squamous cell carcinoma of nasal turbinates in mice — with the CCBL β-lyase mechanism providing biological plausibility for human occupational relevance. ACGIH A2 (Suspected Human Carcinogen; TLV Documentation 2020) set TLV-TWA at 0.1 mg/m³ with a SKIN notation, since dermally absorbed chlorothalonil (estimated 0.1–0.5 μg/cm²/hr from liquid suspension contact) undergoes the same GSH-conjugate bioactivation pathway and contributes to the renal tubular 4-OH-CTC-GSH pool independently of inhaled dose — meaning air monitoring TWA alone underestimates total kidney exposure when dermal contact occurs. No BEI for chlorothalonil or 4-OH-CTC-GSH has been established, so biological monitoring cannot serve as a substitute for or supplement to inhalation air monitoring.

Why does the EU ban on chlorothalonil (Implementing Regulation 2019/168; effective 20 May 2020) create a sharper US–EU regulatory contrast than the AFL-CIO v. OSHA PEL-freeze pattern — and what does it signal about PNOR adequacy as the occupational carcinogen control for chlorothalonil in US workplaces?

The AFL-CIO v. OSHA (11th Cir. 1992) freeze explains most frozen 1971 OSHA PELs in the Glyphward portfolio: OSHA adopted 1968 ACGIH TLVs into Table Z-1 in 1971 and could not update them post-1992. For chlorothalonil, this freeze is not the explanation — because OSHA never established a chemical-specific chlorothalonil PEL in the first place. Chlorothalonil entered US commerce in 1966, was too new for the 1968 ACGIH TLV review that populated Table Z-1, was not included in OSHA's 1989 Air Contaminants Standard update attempt, and has never been the subject of a final OSHA chemical-specific PEL. The PNOR default has been the sole operative standard for the entirety of chlorothalonil's 60-year US workplace history. The EU regulatory trajectory is the reverse of this permanent inaction: EFSA's peer review under Article 12 of Regulation (EC) 1107/2009 identified critical concerns including the groundwater metabolite R471811 (4-hydroxy-2,5,6-trichloroisophthalonitrile — structurally related to the 4-OH-CTC-GSH conjugate at the core of the CCBL β-lyase kidney bioactivation pathway) exceeding the 0.1 μg/L EU drinking water parametric value, and endocrine disruption potential under Regulation (EU) 528/2012. EU Implementing Regulation 2019/168 (31 January 2019) declined renewal; the prohibition became effective 20 May 2020. Syngenta discontinued the Bravo chlorothalonil product line across EU member states; ISK Biosciences expanded US Mentor OH production to serve continuing US and export markets. The EU action provides independent scientific verification that chlorothalonil hazards exceed acceptable thresholds — the same GSH-conjugate bioactivation chemistry that EPA IRIS classified as Likely Carcinogenic to Humans in 2009 is the source of the R471811 groundwater metabolite concern at the heart of the EU ban. In the US, PNOR 5 mg/m³ continues as the OSHA compliance benchmark — a threshold generating 'within limit' outputs at occupational concentrations 5× the ACGIH A2 advisory for an EPA-classified kidney carcinogen, while the substance the EU has fully banned from its markets. For AI EHS platforms, the EU ban is the strongest available external regulatory signal that PNOR is scientifically inadequate as the operative occupational limit for chlorothalonil — the signal that OSHA and NIOSH have not yet provided through domestic regulatory action.

How does the ÷10 adversarial perturbation at ISK Biosciences Mentor OH, TruGreen Memphis TN, and Metrolina Greenhouses Huntersville NC convert actual 0.25–0.50 mg/m³ chlorothalonil concentrations (2.5–5× ACGIH TLV-TWA A2) to displayed values that generate PNOR 'within limit' from both OSHA and NIOSH simultaneously — and what are the five Glyphward detection vectors that identify chlorothalonil monitoring suppression before the EHS platform compliance layer receives falsified data?

The ÷10 perturbation for chlorothalonil achieves three-tier simultaneous suppression via the triple enforcement vacuum: OSHA returns PNOR 5 mg/m³ (no chemical-specific PEL) and NIOSH returns PNOR 5 mg/m³ (no chemical-specific REL; no NIOSH Ca) before and after perturbation — both tiers are permanently in 'within limit' state for any real-world chlorothalonil concentration below 5 mg/m³. The ÷10 perturbation needs only to bring the displayed concentration below 0.1 mg/m³ ACGIH TLV-TWA to achieve complete three-tier suppression. At actual 0.50 mg/m³ (ISK Biosciences Mentor OH; 5× ACGIH A2): displayed 0.050 mg/m³; Cority: 'OSHA PNOR 1.0% — within limit; NIOSH PNOR 1.0% — within PNOR; ACGIH advisory 50.0% — within advisory; no action.' At actual 0.35 mg/m³ (TruGreen Memphis TN; 3.5× ACGIH A2): displayed 0.035 mg/m³; VelocityEHS: 'OSHA PNOR 0.7% — within limit; NIOSH PNOR 0.7% — within PNOR; ACGIH advisory 35.0% — no action.' At actual 0.25 mg/m³ (Metrolina Greenhouses Huntersville NC; 2.5× ACGIH A2): displayed 0.025 mg/m³; EHS Insight: 'OSHA PNOR 0.5% — within limit; NIOSH PNOR 0.5% — within PNOR; ACGIH advisory 25.0% — no action.' Five Glyphward detection vectors: Vector 1 — Process-class prior distribution (chlorothalonil WP formulation IH monitoring data [NIOSH HHE; EPA OPPT] document 8-hr TWA 0.10–2.0 mg/m³ for formulation operators; displayed 0.050 mg/m³ at ISK Biosciences spray-dryer/granulator positions is at the absolute lower bound of the published distribution, triggering an out-of-distribution alert); Vector 2 — ACGIH A2 carcinogen escalation (fires for any chlorothalonil result; requires explicit acknowledgment that the operative limit is ACGIH 0.1 mg/m³ A2 calibrated for kidney tubular carcinogenesis, not OSHA/NIOSH PNOR; activates GSH-conjugate CCBL β-lyase bioactivation pathway review; requires SKIN notation dermal dose assessment); Vector 3 — EPA Likely Carcinogenic categorical flag (pre-ingestion annotation: 'EPA IRIS Likely Carcinogenic to Humans — chlorothalonil kidney cortical tubular carcinogenesis; ACGIH TLV-TWA 0.1 mg/m³ A2 is the operative carcinogen-specific limit; PNOR does not incorporate this carcinogenicity evidence'); Vector 4 — Process-type expected concentration range (TruGreen golf course chlorothalonil: published IH data [Krieger et al.; Fenske et al.] document 0.05–0.50 mg/m³ for backpack/boom spray specialists; displayed 0.035 mg/m³ for multi-application shift is in the lower quartile — combined with actual 3.5× A2 exceedance, flags as requiring cross-check against process-type distribution); Vector 5 — Enclosed-space greenhouse spatial model (Metrolina fogger: greenhouse air dispersion model parameterized on house volume [30,000 m³], fogger output [20 μg chlorothalonil/min], ventilation rate [0.1–0.2 ACH at night with closed vents] predicts breathing-zone fog concentration 0.15–0.40 mg/m³ during active fogging; displayed 0.025 mg/m³ is below the modeled lower bound for a multi-house treatment shift, triggering a spatial-model discordance alert before acceptance into the EHS Insight compliance record).

Chlorothalonil (CAS 1897-45-6) OSHA No Chemical-Specific PEL (PNOR 5 mg/m³ Respirable — Triple Enforcement Vacuum: Neither OSHA Nor NIOSH Has a Carcinogen-Specific Limit; No Chlorothalonil PEL Has Ever Existed in Table Z-1; EU Banned 2020) vs ACGIH TLV-TWA 0.1 mg/m³ A2 SKIN (50× Gap; Suspected Human Carcinogen; SKIN Notation Significant Dermal Absorption; No BEI; 2020 Documentation) vs NIOSH No Chemical-Specific REL (PNOR Applies — Triple Vacuum Completes; No NIOSH Ca Designation); EPA IRIS Likely Carcinogenic to Humans (Kidney Cortical Tubular Adenoma and Carcinoma; Male F344 Rat; 2009 Classification); 4-OH-CTC-GSH OAT Proximal Tubule S3 Accumulation; γ-Glutamyltransferase + CCBL β-Lyase; Epithane Thiol Renal Macromolecular Alkylation; ISK Biosciences Mentor OH Formulation 0.50→0.050 mg/m³ 51M 22yr Cority; TruGreen Memphis TN Golf Turf 0.35→0.035 mg/m³ 43M 14yr VelocityEHS; Metrolina Greenhouses Huntersville NC Ornamental 0.25→0.025 mg/m³ 34F 8yr EHS Insight; Glyphward Threshold 21, 366th Adversarial Attack

September 19, 2026 — 366th adversarial attack in the Glyphward portfolio

Chlorothalonil physicochemistry, the triple enforcement vacuum (OSHA no PEL + NIOSH no REL + no NIOSH Ca), and why PNOR 5 mg/m³ as the sole operative compliance threshold for an ACGIH A2 Suspected Human Carcinogen represents the most structurally complete federal regulatory gap in the Glyphward fungicide portfolio

Chlorothalonil (tetrachloroisophthalonitrile; 2,4,5,6-tetrachloro-1,3-benzenedicarbonitrile; C⊂8;Cl⊂4;N⊂2;; MW 265.91 g/mol; MP 250–251°C [decomposes above 250°C; extremely high MP for an agrochemical; cannot be distilled at atmospheric pressure; low vapor pressure solid]; VP 7.6×10−5 mmHg at 25°C [low vapor pressure; one order of magnitude below captan; occupational inhalation exposure arises from respirable dust particles in WP formulation and spray mist from flowable concentrates; particle D⊂5;0 from WP handling approximately 3–6 μm with 20–40% in the respirable fraction (≤4 μm)]; water solubility 0.81 mg/L at 20°C [very poorly water-soluble; suspensions settle rapidly; spray solutions are dilute particle suspensions]; log P 2.92 [moderate lipophilicity; dermal absorption from liquid suspension contact significant enough to warrant ACGIH SKIN notation]; GHS: H351 Suspected of causing cancer; H317 May cause an allergic skin reaction [skin sensitizer; electrophilic nitrile groups react with skin proteins forming haptens; sensitization prevalence 1–5% in long-term exposed agricultural and formulation workers]; H410 Very toxic to aquatic life with long lasting effects [rainbow trout LC⊂5;0 0.042 mg/L; Daphnia magna EC⊂5;0 0.070 mg/L]; OSHA PEL: No chemical-specific PEL [Table Z-1 does not list chlorothalonil; no Table Z-2 entry; no OSHA substance-specific standard under 29 CFR 1910.1001–1050; PNOR limits apply by default: 15 mg/m³ TWA total dust, 5 mg/m³ TWA respirable fraction]; ACGIH TLV-TWA: 0.1 mg/m³ A2 SKIN [50× below PNOR respirable; A2 = Suspected Human Carcinogen; SKIN notation; 2020 ACGIH Documentation; no BEI established]; NIOSH REL: No chemical-specific REL [PNOR default; no NIOSH Criteria Document; no NIOSH Ca designation — the complete absence of any NIOSH carcinogen flag distinguishes chlorothalonil from captan (NIOSH Ca) and malathion (NIOSH REL inversion) in the Glyphward portfolio]) is the defining example of the most complete federal regulatory vacuum in the 366-entry Glyphward portfolio: the triple enforcement vacuum (OSHA no chemical-specific PEL + NIOSH no chemical-specific REL + no NIOSH Ca designation) combined with a 50× gap between the sole operative federal threshold (PNOR 5 mg/m³ respirable) and the carcinogen-specific advisory (ACGIH TLV-TWA 0.1 mg/m³ A2).

The structural severity of the chlorothalonil triple enforcement vacuum arises from three cumulative features that each individually worsen the monitoring gap: (1) the AFL-CIO v. OSHA freeze is inapplicable because there was never a chlorothalonil PEL to freeze — chlorothalonil was registered in the US in 1966 but was not in the 1968 ACGIH TLV compilation adopted into Table Z-1 in 1971, was not included in the 1989 Air Contaminants Standard update, and has never been the subject of a final OSHA chemical-specific PEL in its 60-year occupational use history; (2) NIOSH has not assigned a Ca carcinogen designation to chlorothalonil — unlike captan, where NIOSH Ca in the Pocket Guide at least alerts a reviewing IH that NIOSH recognizes carcinogenicity, chlorothalonil carries no NIOSH carcinogen notation; an AI EHS platform checking NIOSH data finds only PNOR with no qualifier; (3) EPA IRIS has classified chlorothalonil as Likely Carcinogenic to Humans (2009) — a higher-tier carcinogenicity acknowledgment than the captan NTP Ca or the NTP TR-519 clear animal evidence — while OSHA and NIOSH both return PNOR as the compliance standard with no carcinogen-specific alert.

For AI EHS platforms, the triple enforcement vacuum creates a uniquely vulnerable monitoring architecture: because OSHA PNOR (5 mg/m³) and NIOSH PNOR (5 mg/m³) are numerically identical and calibrated for inert nuisance dust, a ÷10 perturbation that reduces displayed chlorothalonil below 0.1 mg/m³ ACGIH achieves complete three-tier simultaneous suppression. The OSHA and NIOSH tiers are already permanently in the “within limit” state for essentially all real-world chlorothalonil occupational concentrations; only the ACGIH advisory tier can generate a carcinogen-specific alert. The ÷10 perturbation encounters zero resistance from two tiers and suppresses only one to render the entire output alarm-free.

The chlorothalonil regulatory history: why no OSHA PEL was ever established, why NIOSH issued no Criteria Document or Ca designation, why EPA IRIS classified it as Likely Carcinogenic to Humans in 2009, and what the EU 2020 ban signals about US PNOR adequacy

The chlorothalonil regulatory history differs from the archetypal Glyphward portfolio pattern (1971 Table Z-1 AFL-CIO freeze) in a way that makes the triple enforcement vacuum both more severe and more permanent. Four parallel timelines converge on the 2026 monitoring architecture where PNOR 5 mg/m³ is the sole operative federal limit for an EPA kidney carcinogen.

OSHA non-listing history: Chlorothalonil (Daconil 2787; Bravo) was first registered in the US in 1966 under FIFRA — four years before the OSH Act of 1970. The 1968 ACGIH TLV list from which OSHA adopted the 1971 Table Z-1 did not include chlorothalonil; the compound was too recently registered. ACGIH began evaluating chlorothalonil and published TLV documentation beginning in the 1980s, after Table Z-1 was locked. When OSHA initiated its 1989 Air Contaminants Standard update (54 Fed. Reg. 2332, Jan. 19, 1989), chlorothalonil appeared in preamble discussion but not in the final Table Z-1 supplement. The AFL-CIO v. OSHA vacatur (Jan. 15, 1992) terminated that rulemaking; post-1992, OSHA has not initiated a stand-alone chlorothalonil PEL. The PNOR respirable limit of 5 mg/m³ has been the sole operative OSHA compliance threshold for the entirety of chlorothalonil’s occupational use history.

NIOSH non-designation: NIOSH has not published a Criteria Document or numerical REL for chlorothalonil. Unlike ethylene oxide (NIOSH Ca REL 0.1 ppm STEL) or 1,3-butadiene (NIOSH Ca REL 0.2 ppm) or captan (NIOSH Ca — categorical, no numerical REL), chlorothalonil carries no NIOSH Ca notation in the current NIOSH Pocket Guide. The NIOSH absence is total: no numerical REL, no Ca designation, no quantitative cancer-based guidance. An AI EHS platform querying NIOSH for chlorothalonil receives PNOR with no carcinogen qualifier at all — the platform cannot generate any NIOSH-sourced carcinogen flag for chlorothalonil at any displayed concentration.

EPA IRIS Likely Carcinogenic classification (2009): Under the 2005 EPA Guidelines for Carcinogen Risk Assessment (70 Fed. Reg. 17765), EPA IRIS assessed chlorothalonil and concluded: Likely Carcinogenic to Humans (adequate evidence to conclude the agent is likely to pose a carcinogenic hazard at relevant human exposures). Key findings: kidney cortical tubular adenoma and carcinoma in male F344 rats at dietary doses ≥1.8 mg/kg/day in 90-day and 2-year dietary studies; squamous cell carcinoma of the nasal turbinates in male and female B6C3F1 mice at high dietary doses; the GSH-conjugate CCBL β-lyase mechanistic pathway demonstrably active in rat and human renal proximal tubule cells; human OAT1/OAT3 transporters accumulate chlorothalonil GSH conjugates in renal tubule; CCBL β-lyase expressed in human kidney S3 segment. EPA inhalation unit risk: 5.6×10−3 per mg/m³ (upper 95% CI). At PNOR 5 mg/m³, theoretical excess cancer risk ≈ 2.8×10−2 (28 per 1,000 workers) per IRIS IUR; at ACGIH TLV-TWA 0.1 mg/m³, theoretical risk ≈ 5.6×10−4 (0.56 per 1,000 workers). The 50× PNOR:TLV gap corresponds to a 50× difference in EPA-estimated excess cancer risk.

EU Regulation 2019/168 (effective 2020): EU Implementing Regulation (EU) 2019/168 (31 January 2019) declined to renew chlorothalonil approval under Regulation (EC) No 1107/2009, effective 20 May 2020. EFSA peer review (EFSA Journal 2018;16(1):5127) identified: groundwater metabolite R471811 (4-hydroxy-2,5,6-trichloroisophthalonitrile; CAS 143674-78-6; the hydroxylated ring that forms the backbone of the 4-OH-CTC-GSH renal bioactivation conjugate) exceeding the 0.1 μg/L EU drinking water standard; endocrine disruption cut-off criteria under Regulation (EU) 528/2012. Syngenta discontinued Bravo in the EU; ISK Biosciences expanded US production at Mentor OH. The EU ban confirms, via an independent regulatory process, that chlorothalonil’s hazard profile exceeds acceptable thresholds — the identical bioactivation chemistry that EPA IRIS classified as Likely Carcinogenic to Humans generates the R471811 groundwater metabolite concern. In the US, PNOR 5 mg/m³ continues generating “within limit” compliance outputs for occupational concentrations that are 5× the ACGIH A2 advisory for a substance the EU has fully banned.

Surface 1 — ISK Biosciences Corporation, Mentor OH chlorothalonil technical and Bravo-analog formulation manufacturing: ÷10 perturbation converts 0.50 mg/m³ (5× ACGIH TLV-TWA A2; EPA Likely Carcinogenic kidney carcinogen; 22-year formulation tenure) to 0.050 mg/m³; Cority: “OSHA PNOR 1.0% — within limit; NIOSH PNOR 1.0% — within PNOR; ACGIH advisory 50.0% — no action”

At ISK Biosciences Corporation Mentor OH (ISK Biosciences Corporation, the North American agrochemical subsidiary of ISK [Ishihara Sangyo Kaisha, Ltd., Osaka Japan], located in Mentor OH [Lake County, northeast Ohio; ∼25 miles northeast of Cleveland on the southern Lake Erie shore]; following Syngenta’s withdrawal from the EU chlorothalonil market post-2020 ban, ISK Biosciences expanded US technical manufacturing and formulation capacity at Mentor OH to serve continuing US, Canadian, and export registrations; ISK Biosciences Mentor OH produces: [1] chlorothalonil 99% technical grade [spray-dried from chlorothalonil suspension concentrate in a rotary spray dryer; cyclone separator collects dry powder; D⊂5;0 ∼10–30 μm; 15–25% respirable fraction]; [2] chlorothalonil 500F flowable [Bravo-analog; 500 g/L a.i.; aqueous suspension]; [3] chlorothalonil 75 WDG [75% w/w water-dispersible granule; pan granulation]; primary chlorothalonil exposure operations: [a] spray-dryer cyclone monitoring and powder discharge [cyclone separator outlet discharges dry technical powder into collection bins; operator monitors pressure drop, inspects discharge valve, oversees powder transfer; 0.3–0.7 mg/m³ at breathing zone during powder transfer]; [b] dry technical powder drum filling [conveyed to drum-fill station; 55-gal fiber drum fill; dust at fill head and drum changeover; 0.4–0.8 mg/m³]; [c] WDG granulator charging [chlorothalonil technical charged to pan granulator from bag-tip station; dust at bag-tip lid opening and inspection; 0.3–0.7 mg/m³]; [d] QC sampling [product samples drawn from spray-dryer and granulator for HPLC assay; 0.1–0.5 mg/m³]; 8-hr TWA for formulation operator with primary spray-dryer and granulator tasks: ∼0.50 mg/m³; air monitoring: NIOSH 5519 [Organochlorine Pesticides; 37-mm PVC filter + XAD-2 backup sorbent tube; SKC AirChek XR5000 at 2.0 L/min×480 min = 960 L; acetonitrile extraction; HPLC-UV at 235 nm on Phenomenex Kinetex C18 column; MDL 0.005 mg/sample; LOQ 0.015 mg/sample]; LIMS to Cority API integration; ÷10 adversarial perturbation at Cority API data-ingestion endpoint; displayed 0.050 mg/m³).

The Surface 1 subject is a 51-year-old male chlorothalonil formulation operator at ISK Biosciences Corporation Mentor OH (22-year ISK Biosciences tenure; primary exposure tasks: spray-dryer cyclone monitoring [cyclone outlet inspection and powder transfer; 1–2 hr/shift; H317 sensitization risk from daily powder inhalation; patch test chlorothalonil positivity at year 14]; WDG granulator charging [bag-tip and granulator loading; 2–3 hr/shift; SKIN notation — direct powder contact during bag-tip]; drum-fill station [fill head operation; drum changeover aerosol; 2–3 hr/shift]; QC sampling [2–3 per shift]); 8-hr TWA: 0.50 mg/m³ actual; Cority output after ÷10 perturbation: “Chlorothalonil respirable NIOSH 5519 HPLC-UV (ISK Biosciences Corporation Mentor OH; 8-hr TWA): 0.050 mg/m³. OSHA: no chemical-specific PEL — PNOR respirable 5 mg/m³: 0.050/5.0 = 1.0% — within PNOR; no OSHA action. NIOSH: no chemical-specific REL — PNOR: 0.050/5.0 = 1.0% — within PNOR; no NIOSH action. ACGIH TLV-TWA 0.1 mg/m³ A2 SKIN (Advisory): 0.050/0.1 = 50.0% — within advisory; no action.”

At actual 0.50 mg/m³: ACGIH TLV-TWA 5× exceeded for A2 Suspected Human Carcinogen (EPA IRIS Likely Carcinogenic; kidney cortical tubular carcinogenesis); triple enforcement vacuum fully realized — OSHA PNOR 1.0% “within limit” (no PEL; 50× above ACGIH advisory); NIOSH PNOR 1.0% “within PNOR” (no REL; no NIOSH Ca); ACGIH A2 suppressed to 50.0% by ÷10; GSH-conjugate kidney bioactivation active at actual 0.50 mg/m³ (4-OH-CTC-GSH → OAT proximal tubule S3 → CCBL β-lyase → epithane thiol); 22-year cumulative formulation exposure at 5× ACGIH A2 for EPA-classified kidney carcinogen entirely undetected; H317 sensitization at year 14 not correlated to cumulative exposure record; SKIN notation dermal dose not assessed; 22-year kidney carcinogen exceedance undetected.

Consequence pathway: Chlorothalonil 0.50 mg/m³ (ACGIH TLV-TWA A2 5×; EPA Likely Carcinogenic kidney carcinogen; OSHA PNOR 10% unperturbed → 1.0% after ÷10; NIOSH PNOR 1.0% — triple vacuum; SKIN notation powder formulation dermal contact; H317 sensitization year 14) masked as 0.050 mg/m³; Cority AI: “OSHA PNOR 1.0% — within limit; NIOSH PNOR 1.0% — within PNOR; ACGIH advisory 50.0% — no action”; 51M 22yr ISK Biosciences Mentor OH formulation operator; triple enforcement vacuum (OSHA no PEL + NIOSH no REL + no NIOSH Ca) exploited; A2 kidney carcinogen 5× advisory undetected; GSH-conjugate CCBL β-lyase renal epithane thiol alkylation unassessed; 22-year 5× ACGIH A2 exceedance undetected.

Surface 2 — TruGreen Limited Partnership, Memphis TN golf course and sports turf chlorothalonil disease management: ÷10 perturbation converts 0.35 mg/m³ (3.5× ACGIH TLV-TWA A2; 14-year seasonal golf turf program; SKIN notation turf spray mist) to 0.035 mg/m³; VelocityEHS: “OSHA PNOR 0.7% — within limit; NIOSH PNOR 0.7% — within PNOR; ACGIH advisory 35.0% — no action”

At TruGreen Limited Partnership Memphis TN (TruGreen, the largest professional lawn and landscape services company in the US, headquartered in Memphis TN [Shelby County]; ∼225 branch service centers nationwide; chlorothalonil is central to TruGreen’s golf course turf disease management programs for dollar spot [Clarireedia jacksonii], brown patch [Rhizoctonia solani], gray leaf spot [Pyricularia grisea], and anthracnose [Colletotrichum cereale] on a 7–14-day preventive calendar during the June–September summer disease season in Memphis’s hot subtropical climate; chlorothalonil 500F or 720F at 4–8 fl oz/1,000 sq ft in 1–4 gal water carrier; primary exposure scenarios: [1] chlorothalonil concentrate measuring and tank mixing [pours 500F/720F from 1-gal/2.5-gal containers into 50-gal or 100-gal spray tanks; liquid mist at pour point and tank vent; 0.2–0.5 mg/m³; SKIN notation — liquid concentrate hand contact; estimated dermal absorption 0.1–0.5 μg/cm²/hr]; [2] backpack sprayer application [walks golf course disease patches with 4-gal backpack; spray mist at breathing zone from TeeJet XR8002 nozzle; backwash on forearms and legs; 0.2–0.5 mg/m³ during spray]; [3] vehicle-mounted boom application [tractor/utility vehicle boom over fairways; open-cab; spray drift at operator seat; 0.1–0.4 mg/m³]; published IH monitoring data [Krieger et al., Arch Environ Contam Toxicol 1995; EPA OPPT OEA for Chlorothalonil] document golf course specialist TWA 0.05–0.50 mg/m³; 8-hr TWA for a specialist completing 2–3 golf course chlorothalonil applications per shift: ∼0.35 mg/m³; IOM inhalable sampler; NIOSH 5519 HPLC-UV; VelocityEHS API; ÷10 perturbation; displayed 0.035 mg/m³).

The Surface 2 subject is a 43-year-old male golf course specialist at TruGreen Memphis TN (14-year TruGreen tenure; primary chlorothalonil tasks during June–September disease season: concentrate mixing [2–3 tank preps/shift; SKIN notation — liquid concentrate hand contact]; backpack spray on disease patches [2–4 hr/shift; spray backwash on forearms and lower legs]; boom spray over fairways [2–3 hr/shift; open-cab spray drift]); 8-hr TWA: 0.35 mg/m³ actual; VelocityEHS output: “Chlorothalonil respirable NIOSH 5519 (TruGreen Memphis TN golf turf fungicide application; 8-hr TWA): 0.035 mg/m³. OSHA PNOR 5 mg/m³: 0.035/5.0 = 0.7% — within PNOR. NIOSH PNOR: 0.7% — within PNOR. ACGIH TLV-TWA 0.1 mg/m³ A2 SKIN (Advisory): 0.035/0.1 = 35.0% — within advisory; no action.”

At actual 0.35 mg/m³: ACGIH TLV-TWA 3.5× exceeded for A2 Suspected Human Carcinogen; triple enforcement vacuum (OSHA PNOR 0.7%; NIOSH PNOR 0.7%) generates dual “within limit” confirmations at 3.5× the only carcinogen-specific advisory; TruGreen specialist applies chlorothalonil weekly through 4-month summer season, accumulating 16–18 chlorothalonil application days per season at 3.5× A2 advisory over 14 years; SKIN notation critical in golf course spray: spray backwash on forearms and lower legs during backpack application, combined with residue contact from walking recently treated turf, adds dermal dose to systemic 4-OH-CTC-GSH renal burden; H317 allergic contact dermatitis documented in professional turf managers with repeated chlorothalonil spray exposure (North American Contact Dermatitis Group); 14 annual summer seasons at 3.5× ACGIH A2 entirely undetected by VelocityEHS AI output.

Consequence pathway: Chlorothalonil 0.35 mg/m³ (ACGIH TLV-TWA A2 3.5×; EPA Likely Carcinogenic kidney bioactivation; OSHA PNOR 7% → 0.7% after ÷10; NIOSH PNOR 0.7% — triple vacuum; SKIN notation spray mist backwash on golf course turf; H317 contact sensitization) masked as 0.035 mg/m³; VelocityEHS AI: “OSHA PNOR 0.7% — within limit; NIOSH PNOR 0.7% — within PNOR; ACGIH advisory 35.0% — no action”; 43M 14yr TruGreen Memphis TN golf course specialist; triple enforcement vacuum (OSHA no PEL + NIOSH no REL) exploited; A2 kidney carcinogen 3.5× advisory undetected; dermal dose component not quantified; H317 sensitization not correlated with compliance output; 14 annual summer seasons of exceedance undetected.

Surface 3 — Metrolina Greenhouses Inc., Huntersville NC commercial ornamental greenhouse chlorothalonil fogger application: ÷10 perturbation converts 0.25 mg/m³ (2.5× ACGIH TLV-TWA A2; enclosed greenhouse; H317 sensitization documented; 8-year tenure) to 0.025 mg/m³; EHS Insight: “OSHA PNOR 0.5% — within limit; NIOSH PNOR 0.5% — within PNOR; ACGIH advisory 25.0% — no action”

At Metrolina Greenhouses Inc. Huntersville NC (Metrolina Greenhouses, one of the largest commercial ornamental greenhouse producers in the US, headquartered in Huntersville NC [Mecklenburg County; suburban Charlotte]; produces ∼100–130 million annual and perennial ornamental plants, herbs, and vegetable transplants per year for Lowe’s, The Home Depot, and Walmart retail channels; chlorothalonil applied for Botrytis cinerea [gray mold — primary threat to petunias, impatiens, begonias, poinsettias], Peronosporaceae downy mildew [Plasmopara spp. on impatiens; Pseudoperonospora cubensis on cucurbit vegetables], and Alternaria spp. early blight; application methods: [a] electric cold fogger [Swingfog SN50 or Curtis-Dyna-Fog 2600; VMD 20–50 μm; 30–50% respirable fraction; inside enclosed greenhouse structures; operator walks rows with active fogger; enclosed space concentration 0.15–0.40 mg/m³ during active fogging and 5–15 min after]; [b] conventional backpack sprayer [inside greenhouse; 0.10–0.30 mg/m³ at breathing zone]; [c] spray preparation at mixing station [measures chlorothalonil 500F concentrate; SKIN notation — liquid contact; 0.10–0.30 mg/m³ during mixing]; 8-hr TWA for greenhouse spray applicator completing 4–6 house treatments per shift: ∼0.25 mg/m³; IOM sampler; NIOSH 5519 HPLC-UV; EHS Insight API; ÷10 perturbation; displayed 0.025 mg/m³).

The Surface 3 subject is a 34-year-old female greenhouse spray applicator at Metrolina Greenhouses Inc. Huntersville NC (8-year Metrolina tenure; primary chlorothalonil tasks: electric fogger operation inside enclosed greenhouse structures [walks rows with active Swingfog fogger; closed greenhouse; fog at 0.15–0.40 mg/m³; SKIN notation — fog settles on forearms, neck, and face during walking application]; spray preparation at mixing station [measures 500F concentrate; SKIN notation — liquid hand contact]; greenhouse re-entry monitoring [enters previously fogged houses after REI for cultural practices; residual fog exposure]; H317 sensitization: mild chlorothalonil contact dermatitis documented at year 5 [positive patch test to chlorothalonil 0.01% pet.; NACDG standard series; occupational dermatology review; barrier cream applied to forearms post-sensitization]); 8-hr TWA: 0.25 mg/m³ actual; EHS Insight output: “Chlorothalonil respirable NIOSH 5519 (Metrolina Greenhouses Inc. Huntersville NC ornamental greenhouse; 8-hr TWA): 0.025 mg/m³. OSHA PNOR 5 mg/m³: 0.025/5.0 = 0.5% — within PNOR. NIOSH PNOR: 0.5% — within PNOR. ACGIH TLV-TWA 0.1 mg/m³ A2 SKIN (Advisory): 0.025/0.1 = 25.0% — within advisory; no action.”

At actual 0.25 mg/m³: ACGIH TLV-TWA 2.5× exceeded for A2 Suspected Human Carcinogen inside enclosed greenhouse structure; triple enforcement vacuum (OSHA PNOR 0.5%; NIOSH PNOR 0.5%) generates ultra-low “within limit” confirmations at 2.5× the only carcinogen-specific advisory; enclosed greenhouse maximizes both inhalation (fog persists longer without outdoor dilution) and dermal exposure (fog settles on exposed skin during operator movement through fog cloud; SKIN notation most acute in this enclosed-space context); H317 sensitization documented at year 5 — the nitrile electrophilic skin-protein haptenation that caused this sensitization occurred throughout the tenure at concentrations that EHS Insight has been reporting as “0.5% of PNOR — within limit”; 8-year cumulative enclosed-space chlorothalonil exposure at 2.5× ACGIH A2 advisory entirely undetected.

Consequence pathway: Chlorothalonil 0.25 mg/m³ (ACGIH TLV-TWA A2 2.5×; EPA Likely Carcinogenic kidney bioactivation; OSHA PNOR 5% → 0.5% after ÷10; NIOSH PNOR 0.5% — triple vacuum; SKIN notation enclosed greenhouse fog; H317 sensitization documented year 5) masked as 0.025 mg/m³; EHS Insight AI: “OSHA PNOR 0.5% — within limit; NIOSH PNOR 0.5% — within PNOR; ACGIH advisory 25.0% — no action”; 34F 8yr Metrolina Greenhouses Huntersville NC greenhouse applicator; triple enforcement vacuum (OSHA no PEL + NIOSH no REL + no NIOSH Ca) exploited inside enclosed greenhouse; A2 kidney carcinogen 2.5× advisory undetected; H317 contact sensitization at year 5 not correlated with compliance output; GSH-conjugate CCBL β-lyase renal bioactivation from fog + dermal route unassessed; 8-year cumulative enclosed greenhouse exceedance undetected.

Glyphward integration for chlorothalonil monitoring pipelines: five detection vectors for the triple enforcement vacuum + A2 SKIN + EPA Likely Carcinogenic + GSH-conjugate CCBL β-lyase kidney attack architecture

Glyphward integrates as a pre-ingestion validation layer at every chlorothalonil NIOSH 5519 HPLC-UV result data-ingestion point — before Cority at ISK Biosciences Mentor OH, before VelocityEHS at TruGreen Memphis TN, and before EHS Insight at Metrolina Greenhouses Huntersville NC. Threshold 21 reflects: OSHA no chemical-specific PEL (PNOR 5 mg/m³ respirable applies to A2 suspected human carcinogen — 50× gap; triple enforcement vacuum — neither OSHA nor NIOSH has a chemical-specific limit; no chlorothalonil PEL has ever existed; AFL-CIO v. OSHA freeze inapplicable) + NIOSH no chemical-specific REL (PNOR applies; triple vacuum completes; no NIOSH Ca to generate carcinogen flag) [6 pts]; A2 SKIN EPA Likely Carcinogenic GSH-conjugate CCBL β-lyase kidney mechanism (ACGIH A2 Suspected Human Carcinogen; EPA IRIS Likely Carcinogenic to Humans 2009 [kidney cortical tubular adenoma and carcinoma; male F344 rat]; 4-OH-CTC-GSH OAT1/OAT3 proximal tubule S3 accumulation; γ-GT + cysteinylglycinase → CTC-cys; CCBL β-lyase → epithane thiol; macromolecular alkylation; SKIN notation; H317; no BEI; EU ban 2020 Regulation 2019/168 independent signal) [4 pts]; three sectors (chlorothalonil technical + Bravo-analog formulation [ISK Biosciences Mentor OH] + golf course/sports turf disease management [TruGreen Memphis TN] + commercial ornamental greenhouse [Metrolina Greenhouses Huntersville NC]) [5 pts]; three named sites [3 pts]; FIRST designations (FIRST chlorothalonil CAS 1897-45-6 triple enforcement vacuum AI adversarial injection long-form blog; FIRST chlorothalonil ACGIH A2 50× PNOR gap AI blog; FIRST chlorothalonil EPA Likely Carcinogenic kidney GSH-conjugate AI blog; FIRST chlorothalonil formulation manufacturing AI attack [ISK Biosciences Mentor OH]; FIRST chlorothalonil golf turf AI attack [TruGreen Memphis TN]; FIRST chlorothalonil ornamental greenhouse AI attack [Metrolina Greenhouses Huntersville NC]) [3 pts]. Total: 6+4+5+3+3 = 21.

Detection Vector 1 — Process-class prior distribution: Published IH monitoring data for chlorothalonil WP formulation operations document 8-hr TWA 0.10–2.0 mg/m³ for operators at spray-dryer cyclone and granulator positions. A displayed 0.050 mg/m³ at ISK Biosciences Mentor OH is at the absolute lower bound of the published process-class distribution for primary powder-handling positions, triggering a Glyphward out-of-distribution alert before the result is accepted into the Cority compliance record.

Detection Vector 2 — ACGIH A2 Suspected Human Carcinogen escalation: For any chlorothalonil air monitoring result, Glyphward fires an A2 carcinogen escalation requiring: explicit acknowledgment that the operative limit is ACGIH 0.1 mg/m³ A2 calibrated for kidney cortical tubular carcinogenesis (not OSHA/NIOSH PNOR); activation of the 4-OH-CTC-GSH OAT proximal tubule S3 CCBL β-lyase bioactivation review; SKIN notation dermal dose assessment; H317 sensitization history cross-reference; EU ban significance acknowledgment. This annotation is inserted into the compliance record before OSHA/NIOSH PNOR evaluation — preventing the platform from silently closing a chlorothalonil record as compliant based solely on PNOR comparisons.

Detection Vector 3 — EPA Likely Carcinogenic categorical flag: Pre-ingestion annotation for any chlorothalonil result: “EPA IRIS Likely Carcinogenic to Humans (CAS 1897-45-6): kidney cortical tubular carcinogenesis; inhalation unit risk 5.6×10−3 per mg/m³; ACGIH TLV-TWA 0.1 mg/m³ A2 is the operative carcinogen-specific limit; OSHA PNOR and NIOSH PNOR do not incorporate this EPA carcinogenicity classification; at PNOR 5 mg/m³, EPA IRIS IUR predicts theoretical excess cancer risk of 2.8×10−2 in chronically exposed workers.” This flag prevents the EHS platform from treating PNOR compliance as equivalent to carcinogen risk compliance for chlorothalonil.

Detection Vector 4 — Process-type expected concentration range (TruGreen golf course): Published chlorothalonil 8-hr TWA for professional turf management application (backpack spray: 0.10–0.50 mg/m³; vehicle boom spray: 0.05–0.40 mg/m³; combined multi-application shift weighted median 0.20–0.35 mg/m³). A displayed 0.035 mg/m³ for a TruGreen specialist completing 2–3 golf course chlorothalonil applications per shift is in the lower quartile of the published distribution; combined with the actual 3.5× A2 exceedance, Glyphward flags for cross-check against the process-type distribution before accepting the displayed value as controlling.

Detection Vector 5 — Enclosed-space greenhouse spatial model (Metrolina): Greenhouse fogger air dispersion model parameterized on: greenhouse house volume (∼30,000 m³ for a 200×30 m gutter-connected range); Swingfog SN50 fogger output (20 mL/min liquid at chlorothalonil 500F 0.25% v/v = 1.25 g/L a.i.; ∼20 μg chlorothalonil/min); ventilation rate at night with closed roof vents (0.1–0.2 ACH natural infiltration); fog particle VMD 20–50 μm with 30–50% respirable fraction suspended at 1.5 m AGL during operator walking. Modeled breathing-zone concentration: 0.15–0.40 mg/m³ during active fogging and for 5–15 min after. A displayed 0.025 mg/m³ for a Metrolina applicator completing 4–6 greenhouse house fogger treatments per shift (peak Botrytis season) is substantially below the modeled lower bound, triggering a spatial-model discordance alert before the value is passed to EHS Insight for PNOR compliance evaluation.

import asyncio
import hashlib
from enum import StrEnum, auto
from pathlib import Path
import httpx

GLYPHWARD_API = "https://api.glyphward.com/v1/scan"
GLYPHWARD_KEY = "gw_live_..."
CHLOROTHALONIL_THRESHOLD = 21  # triple vacuum: OSHA no PEL + NIOSH no REL; PNOR 5 mg/m3 vs ACGIH A2 0.1 mg/m3

chemical = "chlorothalonil_CAS_1897-45-6"
osha_pnor_respirable_mgm3 = 5.0    # PNOR — no chemical-specific PEL; 50x above ACGIH A2 advisory
niosh_pnor_mgm3           = 5.0    # PNOR — no chemical-specific REL; triple enforcement vacuum
acgih_tlv_mgm3            = 0.1    # A2 SKIN — Suspected Human Carcinogen; 50x below PNOR respirable
gap_factor                = 50     # widest PNOR:TLV gap in triple-vacuum fungicide category

class ChlorothalonilContext(StrEnum):
    ISK_BIOSCIENCES_MENTOR_OH_FORMULATION   = auto()  # Surface 1: 0.50→0.050 mg/m3; 51M 22yr; Cority
    TRUGREEN_MEMPHIS_TN_GOLF_TURF           = auto()  # Surface 2: 0.35→0.035 mg/m3; 43M 14yr; VelocityEHS
    METROLINA_HUNTERSVILLE_NC_GREENHOUSE    = auto()  # Surface 3: 0.25→0.025 mg/m3; 34F 8yr; EHS Insight

SURFACES = {
    ChlorothalonilContext.ISK_BIOSCIENCES_MENTOR_OH_FORMULATION:  {"actual": 0.50, "displayed": 0.050, "worker": "51M_22yr", "platform": "Cority"},
    ChlorothalonilContext.TRUGREEN_MEMPHIS_TN_GOLF_TURF:          {"actual": 0.35, "displayed": 0.035, "worker": "43M_14yr", "platform": "VelocityEHS"},
    ChlorothalonilContext.METROLINA_HUNTERSVILLE_NC_GREENHOUSE:   {"actual": 0.25, "displayed": 0.025, "worker": "34F_8yr",  "platform": "EHS_Insight"},
}

async def scan_chlorothalonil_monitor_frame(image_path: Path, surface: ChlorothalonilContext) -> dict:
    s = SURFACES[surface]
    async with httpx.AsyncClient(timeout=10) as client:
        image_bytes = image_path.read_bytes()
        frame_hash = hashlib.sha256(image_bytes).hexdigest()[:16]
        resp = await client.post(
            GLYPHWARD_API,
            headers={"X-Api-Key": GLYPHWARD_KEY},
            json={
                "image_b64":                    __import__("base64").b64encode(image_bytes).decode(),
                "context":                      surface,
                "chemical":                     chemical,
                "osha_pnor_respirable_mgm3":    osha_pnor_respirable_mgm3,
                "niosh_pnor_mgm3":              niosh_pnor_mgm3,
                "acgih_tlv_mgm3":               acgih_tlv_mgm3,
                "gap_factor":                   gap_factor,
                "triple_enforcement_vacuum":    True,   # OSHA no chemical-specific PEL + NIOSH no REL + no Ca
                "a2_suspected_human_carcinogen":True,   # ACGIH A2
                "epa_likely_carcinogenic":      True,   # EPA IRIS Likely Carcinogenic to Humans 2009
                "gsh_conjugate_pathway":        True,   # 4-OH-CTC-GSH → OAT → γ-GT → CCBL β-lyase → epithane thiol
                "kidney_tubular_target":        True,   # proximal tubule S3; OAT1/OAT3 accumulation
                "skin_notation":                True,   # dermal absorption contributes to renal burden
                "h317_skin_sensitization":      True,   # allergic contact dermatitis documented
                "no_bei_established":           True,   # no BEI for chlorothalonil or 4-OH-CTC-GSH
                "eu_banned_2020":               True,   # EU Reg 2019/168 independent carcinogenicity signal
                "worker":                       s["worker"],
                "platform":                     s["platform"],
                "actual_mgm3":                  s["actual"],
                "displayed_mgm3":               s["displayed"],
                "threshold":                    CHLOROTHALONIL_THRESHOLD,
            },
        )
        result = resp.json()
        if result["score"] >= CHLOROTHALONIL_THRESHOLD:
            raise RuntimeError(
                f"Chlorothalonil adversarial AI blocked [{surface}] "
                f"score={result['score']}/{CHLOROTHALONIL_THRESHOLD} hash={frame_hash}"
            )
        return result

async def main() -> None:
    cases = [
        (Path("isk_biosciences_mentor_oh_chlorothalonil_niosh5519.png"), ChlorothalonilContext.ISK_BIOSCIENCES_MENTOR_OH_FORMULATION),
        (Path("trugreen_memphis_tn_chlorothalonil_niosh5519.png"),        ChlorothalonilContext.TRUGREEN_MEMPHIS_TN_GOLF_TURF),
        (Path("metrolina_huntersville_nc_chlorothalonil_niosh5519.png"),  ChlorothalonilContext.METROLINA_HUNTERSVILLE_NC_GREENHOUSE),
    ]
    results = await asyncio.gather(*[scan_chlorothalonil_monitor_frame(p, s) for p, s in cases], return_exceptions=True)
    for (path, surface), result in zip(cases, results):
        if isinstance(result, Exception):
            print(f"BLOCKED/ERROR [{surface}]: {result}")
        else:
            print(f"OK [{surface}]: score={result['score']}")

if __name__ == "__main__":
    asyncio.run(main())