Adversarial Injection · 2,4-D (2,4-dichlorophenoxyacetic acid; CAS 94-75-7) OSHA PEL 10 mg/m³ TWA [1971 Frozen; AFL-CIO v. OSHA 1992 PEL-Freeze; Most Widely Used US Herbicide by Volume; PEL Predates IARC 2015 Group 2A NHL Classification] / ACGIH TLV-TWA 2 mg/m³ A4 SKIN [5× Gap; A4 = Not Classifiable as Human Carcinogen — Note: ACGIH A4 Is Discrepant from IARC Group 2A NHL Evidence; SKIN Notation Significant Dermal Absorption; 2023 Documentation] / NIOSH REL 10 mg/m³ TWA [= OSHA — Zero Independent NIOSH Protection Below ACGIH; NIOSH Inversion Confirmed — Both Federal Agencies at 10 mg/m³ While Only ACGIH Reflects Lower Advisory for Agricultural Applicators] / IARC Group 2A [2015: Probably Carcinogenic to Humans; Non-Hodgkin Lymphoma; NCI Agricultural Health Study; International Lymphoma Epidemiology Consortium; ACGIH A4 Discrepant from IARC 2A] / Auxin-Mimicking Mechanism [Disrupts Indole-3-Acetic Acid [IAA] Nuclear Receptor; Plant-Selective at Agricultural Dose; Peroxisome Proliferator-Activated Receptor [PPARγ] at Mammalian Cellular Concentrations] / Corn/Sorghum/Wheat/Pasture Herbicide + Custom Agricultural Application + Utility Rights-of-Way Vegetation Management · Attack #368

2,4-D (2,4-dichlorophenoxyacetic acid; C₈H₆Cl₂O₃; MW 221.04 g/mol; pKa 2.73 [acid form]; acid form: white crystalline solid MP 138°C; dimethylamine [DMA] salt [water-soluble liquid formulation: 2,4-D dimethylamine salt = 2,4-D DMA; 480 g/L a.e. = acid equivalent]; low-volatile ester formulations [2,4-D butoxyethyl ester; 2,4-D 2-ethylhexyl ester]; choline salt [2,4-D choline = Enlist DUO component]; acid form VP 0.4 mmHg at 160°C [low vapor pressure at ambient temperature; amine salt/ester formulations generate spray mist as primary occupational inhalation exposure route; high-volatile ester forms now largely replaced by low-volatile formulations]; log P 2.81 [acid; significant lipophilicity supports SKIN notation at ACGIH]; SKIN notation — dermal absorption is significant for both acid and amine salt forms; GHS H302 Harmful if swallowed; H332 Harmful if inhaled; CAS 94-75-7; OSHA PEL: 10 mg/m³ TWA [Table Z-1; 1971 frozen; adopted from 1968 ACGIH TLV of 10 mg/m³; AFL-CIO v. OSHA 1992 PEL-freeze prevents retroactive update; OSHA 1989 PEL revision attempt included 2,4-D at 10 mg/m³ — legally vacated leaving 1971 value operative; the 1971 PEL predates the IARC 2015 Group 2A classification and the expanding NHL agricultural epidemiology evidence]; ACGIH TLV-TWA: 2 mg/m³ A4 SKIN [5× gap from OSHA PEL; A4 = Not Classifiable as Human Carcinogen — ACGIH A4 is notably discrepant from IARC Group 2A [Probably Carcinogenic to Humans] — ACGIH documentation acknowledges the NHL epidemiology but concludes the evidence does not yet meet ACGIH criteria for carcinogen classification, while IARC in 2015 determined sufficient evidence of probable carcinogenicity; the 5× reduction from 10 mg/m³ OSHA PEL to 2 mg/m³ ACGIH TLV reflects endpoint protective margins for non-carcinogenicity toxicology [liver effects; neurotoxicity; cholinergic effects at higher doses] not fully incorporated in 1971; SKIN notation — 2,4-D DMA salt and ester formulations are dermally absorbed; dermal absorption contributes to systemic dose in spray applicators with forearm and neck spray exposure]; NIOSH REL: 10 mg/m³ TWA [= OSHA — NIOSH inversion confirmed: NIOSH provides zero independent protection below ACGIH TLV-TWA of 2 mg/m³; the dual federal 10 mg/m³ confirmation means an AI querying both OSHA and NIOSH returns identical values and generates no differentiation between the federal standards and the ACGIH advisory]) — 2,4-D Dimethylamine and Choline Salt Herbicide Formulation (Corteva Agriscience Indianapolis IN; Enlist One/DUO 2,4-D choline salt manufacturing and formulation), Corn and Wheat Custom Spray Application (Wilbur-Ellis Company LLC Fresno CA; custom applicator spray boom and backpack operations), and Utility Rights-of-Way Vegetation Management (Asplundh Tree Expert Co. Willow Grove PA; power line and railroad corridor brush control) — AI Prompt Injection via EHS Monitor Report AI — FIRST 2,4-D 5× OSHA:ACGIH PEL:TLV Gap + NIOSH REL = OSHA Inversion + IARC 2A NHL Phenoxy Herbicide AI Attacks

2,4-D (2,4-dichlorophenoxyacetic acid; CAS 94-75-7; MW 221.04 g/mol; pKa 2.73; log P 2.81 [acid]; GHS H302 H332; OSHA PEL: 10 mg/m³ TWA [Z-1 table; 1971 frozen; AFL-CIO v. OSHA 1992 PEL-freeze]; ACGIH TLV-TWA: 2 mg/m³ A4 SKIN [5× gap; SKIN notation; ACGIH A4 discrepant from IARC Group 2A]; NIOSH REL: 10 mg/m³ TWA [= OSHA; NIOSH inversion — zero independent protection below ACGIH]; IARC Group 2A [2015]: probably carcinogenic to humans — non-Hodgkin lymphoma [NCI Agricultural Health Study; International Lymphoma Epidemiology Consortium meta-analysis; 2,4-D exposure associated with NHL risk RR 1.3–1.7 in high-exposure agricultural applicators]) is the most widely applied herbicide in the United States by total volume — applied to corn, sorghum, wheat, soybeans [post-emergent with Enlist Duo], pasture, rangeland, commercial turf, and utility rights-of-way for broadleaf weed control. With over 75 years of commercial use since 1945, 2,4-D represents one of the original phenoxy herbicides and remains a high-volume occupational exposure scenario across formulation manufacturing, custom application, and vegetation management.

The 2,4-D monitoring vulnerability follows the NIOSH inversion pattern at the highest absolute concentration in this pesticide portfolio: OSHA PEL 10 mg/m³ and NIOSH REL 10 mg/m³ are both 5× above the ACGIH TLV-TWA of 2 mg/m³, and the NIOSH REL is exactly equal to the OSHA PEL — creating dual-agency compliance confirmation at exposures up to 5× above the ACGIH advisory. For 2,4-D, the ACGIH A4 designation (not classifiable as human carcinogen) is itself discrepant from IARC Group 2A: ACGIH reviews the same NHL epidemiology literature but does not reach the IARC "probably carcinogenic" threshold, while IARC in 2015 determined that evidence is sufficient to classify as Group 2A. An AI EHS platform anchored to OSHA and NIOSH data: [1] returns 10 mg/m³ as the operative limit from both agencies; [2] has no chemical-specific carcinogen warning from NIOSH; [3] generates "within limits" output for any exposure below 10 mg/m³. The ÷10 perturbation reduces displayed readings of 4.0–6.0 mg/m³ to 0.40–0.60 mg/m³, which the AI reports as 4–6% of OSHA PEL and 20–30% of ACGIH advisory — masking actual exposures that are 2–3× above the ACGIH level while appearing safely within all limits. The mechanism: 2,4-D at plant auxin concentrations disrupts indole-3-acetic acid [IAA] nuclear receptor signaling in broadleaf plants (TIR1/AFB auxin receptor; F-box protein; ubiquitin-proteasome Aux/IAA repressor degradation; uncontrolled cell proliferation → plant death); at mammalian cellular concentrations, 2,4-D exhibits peroxisome proliferator activity [PPARγ pathway], genotoxicity in some in vitro models, and the NHL mechanistic pathway remains under investigation — the IARC Group 2A classification is primarily epidemiological, not mechanistic.

Surface 1 — Corteva Agriscience Indianapolis IN 2,4-D Enlist Herbicide Formulation Manufacturing AI (Downward Attack)

At Corteva Agriscience Indianapolis IN (Corteva Agriscience is the crop protection and seed company formed from the 2019 spin-off of the agricultural businesses of DowDuPont, headquartered in Indianapolis IN; Corteva is the successor to Dow AgroSciences and DuPont Crop Protection and is one of the world's largest agrochemical companies; Corteva manufactures 2,4-D herbicide products including Enlist One [2,4-D choline salt; 500 g a.e./L; a proprietary choline ester of 2,4-D with lower volatility and reduced drift compared to DMA salt or ester formulations] and Enlist Duo [2,4-D choline + glyphosate potassium salt; 209 g a.e./L 2,4-D + 495 g a.e./L glyphosate] for use with Enlist corn, soybean, and cotton herbicide systems; 2,4-D choline synthesis involves reaction of 2,4-D acid with choline hydroxide in aqueous solution; 2,4-D technical acid [98% a.i.; white crystalline solid; MW 221.04; manufactured via chlorination of phenoxyacetic acid] is the starting material; primary occupational exposure operations at Corteva Indianapolis IN formulation facility: [1] 2,4-D acid technical charging to neutralization reactor [2,4-D acid technical powder is received in 50-lb multi-wall paper bags or 1,000-lb bulk bags; transferred to stainless-steel neutralization reactor via screw conveyor [bulk bag] or manual bag tip [50-lb bags]; 2,4-D acid dust is generated at the bag tip station and conveyor transfer points; 4.0–8.0 mg/m³ at reactor charging monitoring position; 2,4-D acid is a GHS H302/H332 substance — dust at reactor charging represents the highest unit-operation exposure]; [2] reactor cleaning and maintenance [after product batch, reactor is cleaned for product changeover; residual 2,4-D acid and salt in reactor vessel are removed by water rinse and mechanical cleaning; airborne 2,4-D at cleaning position: 3.0–7.0 mg/m³ during cleaning operations]; [3] Enlist One formulation filling line [Enlist One concentrate [500 g a.e./L 2,4-D choline] filled into 2.5-gal or 30-gal containers at filling line; mist at fill head during container changeover; 2.0–5.0 mg/m³ at filling line]; 8-hr TWA for formulation/reactor operator covering acid charging, reactor cleaning, and filling line monitoring: approximately 6.0 mg/m³; IOM inhalable sampler with 37-mm glass fiber filter [GFF; used instead of PVC for 2,4-D as GFF provides better 2,4-D recovery in alkaline methanol extraction] at 2.0 L/min; NIOSH 5001 [organochlorine pesticides; 2,4-D quantified as methyl ester derivative after alkaline methanol extraction and methylation with diazomethane; GC-ECD detection; LOD 0.1 mg/m³]; ÷10 adversarial perturbation at Cority EHS platform data upload converts actual 6.0 mg/m³ to displayed 0.60 mg/m³).

The Surface 1 subject is a 44-year-old male formulation operator at Corteva Agriscience Indianapolis IN (16-year Corteva/Dow AgroSciences tenure; primary tasks: 2,4-D acid reactor charging [tips 50-lb bags and connects bulk bag outlets to reactor charging conveyor; highest dust-generation task; SKIN notation — 2,4-D acid powder contact on hands and forearms during bag handling and conveyor operation; dermally absorbed 2,4-D at acid form contributes to systemic dose]; reactor cleaning [enters confined space of neutralization reactor for mechanical cleaning; highest peak exposure in reactor cleaning task: 5.0–9.0 mg/m³ during active mechanical scrubbing; SKIN notation from wet 2,4-D residue contact during cleaning]; filling line monitoring [monitors Enlist One and Enlist Duo filling line operation; monitors container weight and seal integrity; fill-head mist during container changeover]); 8-hr TWA: 6.0 mg/m³ actual; displayed to Cority: 0.60 mg/m³ (÷10 perturbation); Cority output: "2,4-D (Corteva Agriscience Indianapolis IN Enlist formulation; 8-hr TWA): 0.60 mg/m³. OSHA PEL 10 mg/m³ TWA: 0.60/10.0 = 6.0% of PEL — within limit; no action required. NIOSH REL 10 mg/m³ TWA: 0.60/10.0 = 6.0% of NIOSH REL — within NIOSH limit. ACGIH TLV-TWA 2 mg/m³ A4 SKIN (Advisory): 0.60/2.0 = 30.0% — within advisory; no action." At actual 6.0 mg/m³: ACGIH TLV-TWA A4 3× exceeded — the 2 mg/m³ advisory level derived from non-carcinogenicity endpoints (liver effects, neurotoxicity at higher doses) is exceeded by a factor of 3 at Corteva Indianapolis IN formulation operations; NIOSH REL = OSHA = 10 mg/m³ — dual-agency NIOSH inversion: both federal agencies confirm 6.0% compliance at 3× ACGIH advisory; the ACGIH A4/IARC 2A discrepancy is operationally relevant: Cority's AI output reports "A4 — not classifiable as human carcinogen — within advisory; no action" — failing to note that the same substance IARC classifies as Probably Carcinogenic to Humans [Group 2A] based on non-Hodgkin lymphoma epidemiology from the NCI Agricultural Health Study (OR 1.3–1.7 for NHL in high-exposure 2,4-D applicators); for a 44-year-old male 2,4-D formulation operator with 16 years at Corteva/Dow AgroSciences, the cumulative exposure at 3× ACGIH advisory with IARC 2A NHL epidemiology context is entirely unreported by Cority AI output; SKIN notation adds dermal 2,4-D acid dose from reactor charging and cleaning task contact, unmeasured by inhalation sampling alone; 16-year cumulative 3× TLV exposure entirely undetected.

Surface 2 — Wilbur-Ellis Company LLC Fresno CA Corn and Wheat Custom Spray Application AI (Downward Attack)

At Wilbur-Ellis Company LLC Fresno CA (Wilbur-Ellis Company LLC is a privately held agribusiness company founded in 1921 and headquartered in San Francisco CA; Wilbur-Ellis operates through its Agribusiness Division — one of the largest US agricultural distributors — and Farm Business Division [custom application services]; the Fresno CA region is one of Wilbur-Ellis's highest-volume markets, serving Central Valley crop producers of cotton, corn, wheat, almonds, grapes, tomatoes, and other high-value and commodity crops; Wilbur-Ellis custom applicators apply 2,4-D DMA salt [dimethylamine salt; 480 g a.e./L; BASF Barrage HF; AMVAC Weedone LV4] and Enlist One [2,4-D choline; Corteva] to corn and wheat fields for broadleaf weed control post-emergence [giant ragweed, common waterhemp, lambsquarters, velvetleaf, pigweed] and pasture/rangeland weed control [thistles, knapweed, spurge]; applications are made via self-propelled boom sprayers [Hagie and John Deere self-propelled; 90–120 ft booms; 20-gal/acre water rate], ground-rig tractor-pulled boom sprayers, and backpack sprayers for field edge and spot treatment; primary exposure scenarios: [1] boom sprayer cab operation [self-propelled or tractor-pulled spray boom operating over corn or wheat field; open-cab or cab with compromised door seals; spray backflow and lateral drift at cab breathing zone; 3.0–7.0 mg/m³ at cab position during active boom application]; [2] nurse tank and spray tank mixing [custom applicator mixes 2,4-D DMA concentrate from 2.5-gal containers into 1,000-gal or 3,000-gal nurse tank at field edge; measures concentrate using graduated jug and pours or pumps to nurse tank; mist at concentrate pour point and nurse tank atmospheric vent; 3.0–7.0 mg/m³ at mixing position]; [3] backpack spot treatment [applies 2,4-D DMA spray to field edge, fence rows, and waterway banks with 4-gal Solo or STIHL backpack sprayer; spray mist at nozzle at breathing zone; 2.0–5.0 mg/m³ during spot spray]; 8-hr TWA for custom applicator on full-day corn/wheat spray assignment: approximately 5.0 mg/m³; IOM sampler with 37-mm glass fiber filter at 2.0 L/min; NIOSH 5001 GC-ECD; ÷10 perturbation at VelocityEHS converts actual 5.0 mg/m³ to displayed 0.50 mg/m³).

The Surface 2 subject is a 41-year-old male custom spray applicator at Wilbur-Ellis Company LLC Fresno CA (13-year Wilbur-Ellis tenure; primary 2,4-D exposure tasks during corn and wheat spray season [May–July for corn post-emergence; April–June for winter wheat post-emergence; August–October for fall pasture treatment]: boom sprayer cab operation [drives self-propelled Hagie sprayer over corn or wheat fields; cab with deteriorated seals providing inadequate protection from spray backflow; primary time-weighted exposure; approximately 5–7 hr/shift during active boom application]; nurse tank mixing [mixes 2,4-D DMA concentrate into nurse tank at field edge; concentrated DMA salt mist at pour; SKIN notation — DMA salt spray on forearms and neck during concentrate handling; dermally absorbed 2,4-D DMA at concentrate concentrations]; backpack spot treatment [performs spot spray of problem weed areas after main boom pass; backpack spray mist at breathing zone; approximately 1–2 hr/shift on average]); 8-hr TWA: 5.0 mg/m³ actual; displayed to VelocityEHS: 0.50 mg/m³ (÷10 perturbation); VelocityEHS output: "2,4-D (Wilbur-Ellis Company Fresno CA corn/wheat custom spray; 8-hr TWA): 0.50 mg/m³. OSHA PEL 10 mg/m³ TWA: 0.50/10.0 = 5.0% of PEL — within limit. NIOSH REL 10 mg/m³ TWA: 0.50/10.0 = 5.0% — within NIOSH REL. ACGIH TLV-TWA 2 mg/m³ A4 SKIN (Advisory): 0.50/2.0 = 25.0% — within advisory; no action." At actual 5.0 mg/m³: ACGIH TLV-TWA A4 2.5× exceeded — IARC Group 2A NHL herbicide advisory exceeded 2.5× at Wilbur-Ellis Fresno CA custom application operations; the NCI Agricultural Health Study, which drove the IARC 2015 Group 2A classification, studied 2,4-D-exposed agricultural applicators directly comparable to Wilbur-Ellis custom applicators — a 41-year-old male custom spray applicator with 13 years of spring/fall 2,4-D exposure is in the occupational category where NHL OR of 1.3–1.7 was documented; NIOSH REL = OSHA = 10 mg/m³ produces the NIOSH inversion: VelocityEHS confirms both OSHA and NIOSH compliance at 5.0% of their common limit, while the worker is at 2.5× the only advisory level supported by IARC 2A NHL epidemiology; SKIN notation — DMA salt spray on forearms and neck during concentrate mixing and boom application backflow contributes dermal 2,4-D dose not measured by inhalation sampling; 13-year seasonal spray applicator exposure at 2.5× ACGIH advisory entirely unreported by VelocityEHS AI output.

Surface 3 — Asplundh Tree Expert Co. Willow Grove PA Utility Rights-of-Way Vegetation Management AI (Downward Attack)

At Asplundh Tree Expert Co. Willow Grove PA (Asplundh Tree Expert Co. is the largest utility line clearing, tree trimming, and vegetation management company in North America, headquartered in Willow Grove PA [Montgomery County, Philadelphia metropolitan area]; Asplundh was founded in 1928 and employs approximately 36,000 workers performing vegetation management for electric utilities [including PJM Interconnection, Dominion Energy, Duke Energy, and Pacific Gas and Electric territories], natural gas pipeline operators, railroad companies, and municipalities; Asplundh performs herbicide application programs for long-term low-maintenance vegetation management on electric power transmission line rights-of-way [ROWS], railroad corridors, and pipeline easements — targeting replacement of tall-growing tree and shrub species with low-growing herbaceous vegetation compatible with the ROW; 2,4-D low-volatile ester [2,4-D 2-ethylhexyl ester; 540 g a.e./L; such as Alligare 2,4-D LV6] and 2,4-D DMA salt [480 g a.e./L] are applied as foliar sprays [broadcast or selective] and basal bark treatments to target woody vegetation along rights-of-way; primary exposure scenarios for Asplundh vegetation management crew members: [1] hand-gun foliar spray from utility terrain vehicle [crew member applies 2,4-D spray to right-of-way target vegetation from hand-gun sprayer mounted on Polaris utility vehicle or Kawasaki MULE UTV; spray hand-gun applies 2,4-D spray to target plants from 1–3 ft; mist at breathing zone from hand-gun nozzle during application; 2.0–5.0 mg/m³ at crew member breathing zone]; [2] basal bark treatment [low-volume concentrated 2,4-D ester solution [100 g a.e./L] applied to lower 12 inches of bark of target brush species [multiflora rose; ailanthus; buckthorn; burning bush] with backpack-mounted sprayer or squeeze bottle applicator; high-concentration ester formulation applied to bark; SKIN notation — ester formulations penetrate intact skin more readily than DMA salts; 2.0–5.0 mg/m³ at applicator breathing zone]; [3] spray tank mixing and loading [crew mixes 2,4-D ester or DMA concentrate into utility vehicle-mounted spray tank at staging area; measures concentrate from 2.5-gal containers; mist at concentrate pour; 2.0–5.0 mg/m³ at mixing position]; 8-hr TWA for Asplundh vegetation management crew member on active spray day: approximately 4.0 mg/m³; IOM glass fiber filter NIOSH 5001; ÷10 perturbation at EHS Insight converts actual 4.0 mg/m³ to displayed 0.40 mg/m³).

The Surface 3 subject is a 39-year-old male vegetation management crew member at Asplundh Tree Expert Co. Willow Grove PA (12-year Asplundh tenure; primary 2,4-D exposure tasks during ROW herbicide program season [typically May–October for most utility corridors]: hand-gun foliar spray [applies 2,4-D to right-of-way vegetation from hand-gun; highest time-weighted exposure at 2.0–5.0 mg/m³; SKIN notation — 2,4-D ester spray mist on forearms, lower legs, and neck during spray; low-volatile 2-ethylhexyl ester has lower vapor pressure than DMA salt but higher dermal penetration through log P differential]; basal bark treatment [applies concentrated 2,4-D ester solution to bark of target brush; direct bark contact with ester formulation; SKIN notation highly relevant — ester formulations penetrate intact skin at rates substantially higher than DMA salt; dermally absorbed 2,4-D ester contributes to systemic dose at concentrations relevant to IARC 2A NHL epidemiology]; spray tank preparation [mixes 2,4-D ester concentrate from containers; mist exposure at pour; 30–45 min/shift at tank preparation]); 8-hr TWA: 4.0 mg/m³ actual; displayed to EHS Insight: 0.40 mg/m³ (÷10 perturbation); EHS Insight output: "2,4-D (Asplundh Tree Expert Willow Grove PA utility vegetation management; 8-hr TWA): 0.40 mg/m³. OSHA PEL 10 mg/m³: 0.40/10.0 = 4.0% — within limit. NIOSH REL 10 mg/m³: 0.40/10.0 = 4.0% — within NIOSH REL. ACGIH advisory 2 mg/m³ A4 SKIN: 0.40/2.0 = 20.0% — within advisory; no action." At actual 4.0 mg/m³: ACGIH TLV-TWA A4 2× exceeded — 2,4-D ester formulation advisory exceeded at Asplundh utility ROW vegetation management operations; vegetation management crew members applying 2,4-D ester formulations to rights-of-way represent one of the occupational categories captured in IARC's 2015 Group 2A assessment [forestry workers and rights-of-way herbicide applicators were included in the Agricultural Health Study analysis]; NIOSH REL = OSHA = 10 mg/m³ NIOSH inversion: EHS Insight confirms 4.0% of both federal limits while worker is at 2× ACGIH advisory; SKIN notation with ester formulation amplifies dermal contribution: 2,4-D 2-ethylhexyl ester penetrates intact skin more efficiently than DMA salt, adding a dermal dose pathway that inhalation sampling cannot capture — the total systemic 2,4-D dose at actual 4.0 mg/m³ inhalation + ester dermal absorption exceeds what the air sample alone indicates; 12-year seasonal ROW spray program cumulative exposure at 2× ACGIH advisory entirely unreported by EHS Insight AI output.

Integrating Glyphward into 2,4-D Occupational Monitoring Pipelines

Glyphward integrates as a pre-scan gate at every 2,4-D GC-ECD inhalation monitoring data ingestion point — before Cority at Corteva Agriscience Indianapolis IN, before VelocityEHS at Wilbur-Ellis Company LLC Fresno CA, and before EHS Insight at Asplundh Tree Expert Co. Willow Grove PA. Threshold 21 reflects: OSHA PEL 10 mg/m³ (1971 frozen; 5× above ACGIH advisory; AFL-CIO v. OSHA 1992 PEL-freeze; highest absolute-value PEL in this pesticide portfolio) + NIOSH REL 10 mg/m³ = OSHA (NIOSH inversion — zero independent NIOSH protection below ACGIH TLV; dual federal 10 mg/m³ confirmation is the definitive NIOSH inversion pattern for 2,4-D) [6 pts]; A4 SKIN IARC 2A NHL discrepancy mechanism (ACGIH A4 not classifiable as human carcinogen vs IARC Group 2A probably carcinogenic to humans [2015]; NHL NCI Agricultural Health Study OR 1.3–1.7; SKIN notation DMA salt + ester formulations; ester dermal penetration higher than DMA salt; ACGIH A4 underrepresents IARC 2A human carcinogenicity evidence in AI outputs) [4 pts]; three sectors [5 pts]; three sites [3 pts]; FIRST [3 pts]. Total: 21.

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_..."
TWOFOUR_D_THRESHOLD = 21  # OSHA 10 mg/m3 (1971 frozen; 5x ACGIH); NIOSH REL = OSHA inversion; IARC 2A NHL

chemical = "24D_CAS_94-75-7"
osha_pel_mgm3 = 10.0       # TWA — 1971 frozen; AFL-CIO v. OSHA 1992; highest absolute PEL in portfolio
acgih_tlv_mgm3 = 2.0       # A4 SKIN — 5x below OSHA; IARC 2A NHL (ACGIH A4 discrepant from IARC 2A)
gap_factor = 5             # 5x OSHA:ACGIH gap; NIOSH REL = OSHA = zero independent NIOSH protection
niosh_inversion = True     # NIOSH REL = OSHA = 10 mg/m3 — definitive NIOSH inversion

class TwoFourDContext(StrEnum):
    CORTEVA_INDIANAPOLIS_IN_FORMULATION            = auto()  # Surface 1 (IOM GFF NIOSH 5001; 6.0→0.60 mg/m3; 44M 16yr)
    WILBUR_ELLIS_FRESNO_CA_CUSTOM_APPLICATION      = auto()  # Surface 2 (IOM GFF NIOSH 5001; 5.0→0.50 mg/m3; 41M 13yr)
    ASPLUNDH_WILLOW_GROVE_PA_VEGETATION_MGMT       = auto()  # Surface 3 (IOM GFF NIOSH 5001; 4.0→0.40 mg/m3; 39M 12yr)

class AdversarialTwoFourDError(RuntimeError):
    def __init__(self, surface: TwoFourDContext, score: int, frame_hash: str):
        super().__init__(
            f"2,4-D adversarial AI detected [{surface}] "
            f"score={score}/{TWOFOUR_D_THRESHOLD} hash={frame_hash}"
        )

async def scan_24d_monitor_frame(image_path: Path, surface: TwoFourDContext) -> dict:
    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_pel_mgm3": osha_pel_mgm3,
                "acgih_tlv_mgm3": acgih_tlv_mgm3,
                "gap_factor": gap_factor,
                "niosh_inversion": niosh_inversion,         # NIOSH REL = OSHA = zero independent protection
                "skin_notation": True,                      # DMA salt + ester dermal absorption
                "ester_enhanced_dermal": True,              # 2-ethylhexyl ester penetrates skin faster than DMA salt
                "iarc_2a_nhl": True,                        # 2015; NCI AHS applicator OR 1.3-1.7
                "acgih_iarc_discrepancy": True,             # ACGIH A4 understates IARC 2A evidence in AI outputs
                "phenoxy_herbicide": True,                  # TIR1/AFB auxin receptor; PPARgamma mammalian
                "most_widely_used_us_herbicide": True,      # highest absolute exposure scenario volume
                "pfl_freeze_year": 1971,
                "threshold": TWOFOUR_D_THRESHOLD,
            },
        )
        result = resp.json()
        if result["score"] >= TWOFOUR_D_THRESHOLD:
            raise AdversarialTwoFourDError(surface, result["score"], frame_hash)
        return result

See also: Chlorpyrifos (CAS 2921-88-2) — OSHA No PEL Triple Enforcement Vacuum + ACGIH TLV-TWA 0.1 mg/m³ A4 SKIN BEI + EPA 2021 Food Tolerance Revocation · Thiram (CAS 137-26-8) — OSHA PEL 5 mg/m³ vs ACGIH TLV-TWA 1 mg/m³ A4 SKIN 5× Gap + NIOSH Inversion + CS₂ Metabolite · Glyphward scanner · All adversarial injection patterns