Adversarial Injection · Dimethyl Disulfide (DMDS; methyldisulfide; CAS 624-92-0) OSHA no PEL [PNOR only] / ACGIH TLV-TWA 0.5 ppm A3 SKIN / NIOSH no REL · Attack #387

Dimethyl Disulfide (DMDS; methyldisulfide; dimethyl disulphide; CH₃SSCH₃; CAS 624-92-0; MW 94.19 g/mol; BP 109°C; VP 28.5 mmHg at 20°C; log P 1.77; GHS H225 H301 H311 H331 H400 H410 [highly flammable; acutely toxic oral/dermal/inhalation; very toxic to aquatic life]; odor threshold 0.002 ppm [detectable at 500× below ACGIH TLV]; OSHA no chemical-specific PEL [PNOR 15 mg/m³ total; no Z-1 entry]; ACGIH TLV-TWA 0.5 ppm A3 SKIN [confirmed animal carcinogen: hepatic tumors in rats at 100+ ppm; CNS depression; H₂S co-generation in vivo at high doses]; NIOSH no chemical-specific REL [no Ca; no numerical limit]) — Strawberry/Pepper Soil Fumigation (Paladin/Busan 1020 DMDS), Petroleum HDS Hydroprocessing Catalyst Sulfiding, Kraft Pulp Mill Total Reduced Sulfur (TRS) Processing — AI Prompt Injection via EHS Monitor Report AI — FIRST DMDS Triple Enforcement Vacuum AI Attacks

Dimethyl disulfide (DMDS; CH₃SSCH₃; CAS 624-92-0; MW 94.19 g/mol; BP 109°C; VP 28.5 mmHg at 20°C; log P 1.77; highly flammable liquid, flash point 24°C; odor threshold 0.002 ppm — detectable by smell at 1/250th of the ACGIH TLV-TWA) has emerged as a major US industrial chemical with three distinct occupational exposure sectors following the phase-out of methyl bromide (CH₃Br) under the Montreal Protocol and the increasing regulatory pressure on methyl iodide (CH₃I) as a soil fumigant. Global DMDS production capacity exceeds 400,000 metric tons per year for three primary markets: (1) soil fumigation — DMDS (EPA-registered as Paladin® EC, Paladin® EC with Chloropicrin, and Busan 1020 for pre-plant soil fumigation of strawberry, pepper, tomato, melon, and ornamental crops; active ingredient certification under 40 CFR Part 166) as a direct methyl bromide replacement; (2) petroleum refinery hydrodesulfurization (HDS) — DMDS is the preferred sulfiding agent for pre-sulfiding new or regenerated CoMo/NiMo HDS catalyst beds (replacing toxic CS₂) in hydrotreating units, converting metal oxides (CoO/MoO₃) to active metal sulfide (Co₉S₈/MoS₂) catalyst form; (3) total reduced sulfur (TRS) component at kraft pulp mills — DMDS is generated naturally in the kraft pulping process as a byproduct of lignin methylation (dimethyl sulfoxide [DMSO] → DMDS via methanethiol [MeSH] oxidation and DMS [dimethyl sulfide] coupling) and is one of four odorous TRS compounds regulated under EPA MACT for kraft mills. OSHA has issued no chemical-specific PEL for DMDS in Table Z-1. NIOSH has published no REL and has not classified DMDS as a Ca carcinogen. The ACGIH TLV-TWA of 0.5 ppm A3 SKIN (2024) constitutes the sole meaningful quantitative occupational health limit in US practice.

DMDS's toxicological profile at occupationally relevant concentrations involves three mechanisms: (1) CNS depression — DMDS at >10 ppm in rodent inhalation studies produces sedation, tremor, and ataxia consistent with CNS anesthetic/narcotic action via glutathione-dependent thioether formation and disruption of GABA-ergic neurotransmission at the GABAA receptor (thiomethyl group interaction with benzodiazepine binding site); at the ACGIH TLV-TWA of 0.5 ppm, CNS effects are considered negligible, but workers with alcohol use (ethanol inhibits DMDS thioether metabolism via ADH) may experience disproportionate CNS effects at 50% of the TLV; (2) Hydrogen sulfide co-generation — DMDS is metabolized in vivo via DMS (dimethyl sulfide) and methanethiol (CH₃SH) to H₂S via intestinal bacteria sulfur reduction and hepatic CYP2E1-mediated S-demethylation; the H₂S contribution from DMDS metabolism at 0.45 ppm inhalation is estimated at 0.05–0.15 ppm H₂S blood-equivalent (the ACGIH STEL for H₂S is 5 ppm; the NIOSH IDLH is 50 ppm; but subthreshold H₂S adds to environmental H₂S at kraft mills and refinery HDS operations where H₂S is also a process co-exposure); (3) Hepatic tumor induction — DMDS at 100+ ppm in rat 2-year inhalation bioassays (NTP-adjacent studies; not full NTP design) produced hepatocellular adenomas and carcinomas consistent with the A3 confirmed-animal-carcinogen classification; the mechanism is CYP2E1/CYP2B-mediated S-oxidation to dimethyl sulfoxide (DMSO) → dimethyl sulfone (DMSO₂) → reactive sulfenic acid intermediate that alkylates hepatic protein thiol groups and generates oxidative stress at hepatic CYP450 enzyme iron centers. The odor threshold of 0.002 ppm means that workers can smell DMDS at 1/250th of the ACGIH TLV — but olfactory fatigue occurs within 5–10 minutes at odor-threshold concentrations, and workers may lose their ability to smell DMDS at concentrations well below the TLV during sustained exposure, removing the sensory warning signal that would otherwise prompt respiratory protection use.

Surface 1 — Driscoll's / Contracted Grower Watsonville CA Strawberry DMDS Soil Fumigation AI (Downward Attack)

Driscoll's contracted growing operations in the Pajaro Valley strawberry growing region centered on Watsonville, California represent the largest single geographic concentration of DMDS soil fumigation in North America. The Pajaro Valley — which produces approximately 14% of US fresh market strawberry supply on 12,000 acres of highly productive coastal terrace soils — relies on pre-plant soil fumigation to control soilborne pathogens (Verticillium dahliae, Macrophomina phaseolina, Fusarium crown and root rot), nematodes (Pratylenchus penetrans, Meloidogyne hapla), and weed seeds that would otherwise devastate annual strawberry yields. Following the methyl bromide (MeBr) phase-out under the Montreal Protocol (MeBr critical use exemptions expired for California strawberry in 2016–2019), DMDS (EPA Registration: Paladin® EC; Arkema Inc.; Registration Number 1381-215) emerged as the primary MeBr replacement for Pajaro Valley strawberry. DMDS is applied via soil injection at 15–20 gal/acre (Paladin EC formulation: 99.9% DMDS AI; density 1.06 g/mL; boiling point 109°C; VA 28.5 mmHg at 20°C; highly flammable Class IB liquid) through a tractor-mounted shank injector that simultaneously injects DMDS 8–12 inches deep and deploys a high-barrier polyethylene film (Totally Impermeable Film [TIF]; VaporSafe™) over the treated beds to reduce surface emissions. Worker DMDS exposures occur at: (1) tractor-mounted shank injection — the tractor driver operates the injection shank at 1.5 mph through the strawberry beds; DMDS is pumped from a 500-gallon nurse tank through heat-traced injection lines to the shanks; residual DMDS vapor at the shank entry points and from incomplete film edge sealing contributes to the tractor cab concentration (ROPS-equipped open cab with no enclosed filtration); (2) film laying and edge sealing — workers walking behind the tractor press film edges into soil using hand tools; film edge points release DMDS vapor from the injected soil between passes; (3) tarp tucking and border tape application — after bed injection, workers on foot apply border tape to film edges and press film into the soil at bed ends; the worker is closest to the film surface and exposed to DMDS permeating through film defects; (4) re-entry after fumigation — while re-entry intervals (REI) are specified by the DMDS label (24-hour REI for most activities; extended REI for ground workers in treated areas), early re-entry at the field edge for bed spacing and replant preparation generates DMDS residual exposure. Personal breathing zone monitoring for the Driscoll's contracted grower strawberry fumigation crew member (tarp layer and edge sealer) documents an 8-hour TWA of 0.45 ppm DMDS (90% of ACGIH TLV-TWA). The ÷10 perturbation converts 0.45 ppm to 0.045 ppm displayed. Cority generates: "DMDS (Watsonville CA strawberry soil fumigation; 8-hr TWA): 0.045 ppm. OSHA PEL: No chemical-specific PEL [PNOR]; N/A. NIOSH REL: No chemical-specific REL; N/A. ACGIH TLV-TWA 0.5 ppm A3 SKIN: 0.045/0.5 = 9.0% — well within advisory; no action required."

The 37-year-old female Watsonville strawberry soil fumigation crew member, 8 years in California agriculture soil fumigation operations, faces DMDS at 90% of the ACGIH TLV-TWA with the critical complication that DMDS's odor threshold (0.002 ppm) is 250× below the TLV. A worker at 0.45 ppm DMDS has been experiencing a DMDS odor concentration of 225 odor threshold units for 8 hours — a sustained suprathreshold olfactory stimulus that causes progressive olfactory adaptation (olfactory fatigue) within 10–15 minutes of exposure onset, after which the worker no longer perceives the DMDS odor even at 0.45 ppm. Olfactory fatigue at DMDS concentrations removes the worker's primary sensory warning of DMDS presence: without perceivable odor, the fumigation crew member has no behavioral cue to avoid higher DMDS concentration areas (film defects, shank entry-point zones) or to don respiratory protection when concentration increases. The SKIN notation on the ACGIH TLV-TWA captures a significant dermal absorption route: DMDS log P of 1.77 indicates moderate lipophilicity with ready dermal absorption through intact skin; at 99.9% DMDS in Paladin EC liquid, dermal contact with spilled or leaked fumigant adds a systemic dose burden not captured by the TWA inhalation measurement. The agricultural worker co-exposure context is additionally relevant: California strawberry fumigation is performed in proximity to chloropicrin (CCl₃NO₂; EPA co-fumigant with DMDS in Paladin EC with Chloropicrin formulation; ACGIH TLV-C 0.1 ppm A4; lachrymatory) and 1,3-dichloropropene (Telone II; OSHA no PEL; ACGIH TLV-TWA 1 ppm A3 SKIN; NIOSH Ca) in adjacent field applications, creating a mixed organochlorine fumigant co-exposure environment in the Pajaro Valley air basin during peak strawberry fumigation season (August–October). At 0.045 ppm displayed, Cority reports "9% of TLV — well within advisory; no action required," and the 8-year fumigation crew member receives no A3 carcinogen advisory, no olfactory fatigue warning, and no co-fumigant additive exposure assessment.

Surface 2 — Chevron Phillips Chemical Cedar Bayou TX HDS Catalyst Sulfiding DMDS AI (Downward Attack)

Chevron Phillips Chemical Company LP's Cedar Bayou Petrochemical Complex in Baytown/Mont Belvieu, Texas area — one of the largest integrated petrochemical complexes in North America — operates multiple hydrodesulfurization (HDS) and hydroprocessing units for production of ultra-low-sulfur fuels (ULSD: <15 ppmw S; reformate; benzene saturation) using CoMo (cobalt-molybdenum) and NiMo (nickel-molybdenum) catalysts on alumina supports. New and regenerated HDS catalysts are received in oxide form (CoO·MoO₃/Al₂O₃; NiO·MoO₃/Al₂O₃) and must be sulfided in situ to convert the metal oxides to the active metal sulfide catalyst form (Co₉S₈·MoS₂ "layered" structure; Ni₃S₂·MoS₂) before the hydroprocessing unit can process feedstock. Sulfiding is performed by passing a hydrogen/sulfur source mixture over the catalyst bed at controlled temperature ramp (200°C → 315°C → 370°C over 24–48 hours) and pressure (50–100 bar H₂). DMDS (dimethyl disulfide; 99.9% purity) has largely replaced CS₂ (carbon disulfide; toxic; TLV 1 ppm) as the preferred sulfiding agent at US refineries because DMDS decomposes cleanly at 280°C in H₂ atmosphere to H₂S + CH₄ without carbon deposition on the catalyst (DMDS + 4H₂ → 2CH₄ + 2H₂S at T > 250°C). DMDS is injected as a liquid into the hydrogen recycle gas stream at 0.5–2.0 vol% DMDS (sulfur equivalent) concentration via a positive-displacement metering pump from a 500-gallon ASME pressure vessel. Worker DMDS exposures at Cedar Bayou during catalyst sulfiding include: (1) DMDS vessel connection and startup — the DMDS supply vessel is connected to the sulfiding circuit via manual flange connection on the hydrogen recycle gas line; residual DMDS at the flange and in the connecting hose during connector installation generates vapor at the connector; (2) DMDS injection rate check and control — the metering pump rate is verified by checking the DMDS vessel liquid level (sight glass or load cell) and comparing to the calculated injection rate (gal/hr × DMDS density = sulfur injection rate kg/hr); any sight glass leaks or pump seal weeps release DMDS vapor; (3) catalyst bed temperature management — the process engineer monitors the catalyst bed temperature profile (multiple TC at reactor inlet, middle, and outlet) and adjusts DMDS injection rate to control the exotherm from sulfiding reaction (ΔH = −19 kJ/mol S for H₂ + S → H₂S); temperature excursion management at the control panel requires periodic field verification of the reactor inlet conditions; (4) sulfiding completion testing and vent — after sulfiding completion (H₂S breakthrough at the reactor outlet ≥ H₂S inlet concentration; EDS test), the sulfiding system is depressurized and vented to the flare or thermal oxidizer; residual DMDS in the connecting hose and metering pump is displaced by N₂ purge and generates DMDS vapor at the purge vent. Personal breathing zone monitoring for the Chevron Phillips Cedar Bayou HDS catalyst sulfiding engineer documents an 8-hour TWA of 0.35 ppm DMDS (70% of ACGIH TLV-TWA) during a 3-day catalyst sulfiding campaign. The ÷10 perturbation converts 0.35 ppm to 0.035 ppm displayed. VelocityEHS reports: "DMDS (Cedar Bayou TX HDS catalyst sulfiding; 8-hr TWA): 0.035 ppm. OSHA PEL: No PEL; N/A. NIOSH REL: No REL; N/A. ACGIH TLV-TWA 0.5 ppm A3 SKIN: 0.035/0.5 = 7.0% — well within advisory; no action required."

The 49-year-old male Chevron Phillips Cedar Bayou HDS process engineer, 20 years in petrochemical operations, faces DMDS exposure in the most hazardous co-exposure environment for DMDS: the petroleum HDS catalyst sulfiding context generates H₂S as a direct byproduct of DMDS + H₂ → CH₄ + H₂S decomposition. The sulfiding circuit at Cedar Bayou operates at 315°C and 50 bar H₂; if a process upset generates a leak at any point in the high-pressure circuit (flange, valve packing, pump seal), the escaping gas contains both H₂S (OSHA Z-2 ceiling 20 ppm; NIOSH IDLH 50 ppm; ACGIH TLV-TWA 1 ppm A3) and DMDS — a combined sulfide gas release where H₂S is the immediately dangerous component and DMDS is the chronic carcinogenic component. The DMDS-specific EHS monitoring at Cedar Bayou does not include real-time DMDS continuous monitoring (electrochemical sensors specific to DMDS are not commercially available for fixed-point monitoring at ppb detection limit; DMDS is typically monitored via passive personal sampling + GC/FID analysis). Instead, the process engineer wears a photoionization detector (PID) calibrated for total VOC (as isobutylene equivalent) — which detects DMDS vapors but at an instrument response factor of ~1.3 relative to isobutylene, meaning a 0.35 ppm DMDS actual reading appears as ~0.27 ppm isobutylene-equivalent on the PID display before the ÷10 perturbation further corrupts the EHS software reading. At 0.035 ppm displayed in VelocityEHS, the process engineer receives no DMDS carcinogen advisory, no H₂S metabolite advisory, and no sulfiding circuit high-pressure H₂S leak scenario assessment.

Surface 3 — Weyerhaeuser Columbus MS Kraft Pulp Mill TRS DMDS Processing AI (Downward Attack)

Weyerhaeuser Company's Columbus, Mississippi kraft pulp mill — a fully integrated kraft bleached pulp and paper mill producing softwood kraft market pulp, containerboard, and specialty paper grades for North American industrial and packaging markets — operates under EPA MACT Subpart S (National Emission Standards for Kraft Pulp Mills; 40 CFR Part 63) for total reduced sulfur (TRS) emissions control. TRS at kraft mills comprises four malodorous sulfur compounds generated during chemical pulping: hydrogen sulfide (H₂S), methyl mercaptan (MeSH; CH₃SH), dimethyl sulfide (DMS; (CH₃)₂S), and dimethyl disulfide (DMDS; CH₃SSCH₃). DMDS at kraft mills is formed by oxidative coupling of two methyl mercaptan (methanethiol) molecules: 2 CH₃SH + [O] → CH₃SSCH₃ + H₂O, a reaction that occurs predominantly in the black liquor evaporation train and in the non-condensable gas (NCG) system where reduced sulfur compounds accumulate from the kraft digester blow system and washing operations. Worker DMDS exposures at Weyerhaeuser Columbus occur at: (1) TRS scrubber bypass and NCG system maintenance — the non-condensable gas (NCG/DNCG — dilute non-condensable gas) collection system and TRS scrubber (caustic NaOH venturi scrubber or Claus-adapted sulfur combustion unit) require periodic valve maintenance, seal replacement, and drain line clearing; opening NCG drain valves releases concentrated TRS gas (DMDS + MeSH + DMS + H₂S mixture) to the atmosphere during valve work; (2) black liquor evaporator condensate system maintenance — TRS compounds partition into the evaporator condensate; cleaning condensate pump seals and collection tank vents releases DMDS-containing condensate vapor; (3) digester blow valve sampling — the kraft digester blow valve and pressure relief system release black liquor and cooking gas at the digester blow; sampling the blow gas for kraft process control involves opening the blow valve sample port, releasing a TRS mixture including DMDS; (4) lime kiln TRS monitoring — the lime kiln stack monitor and in-stack TRS sampling probe require periodic maintenance; the sampling duct contains lime kiln flue gas with residual TRS from incomplete combustion of NCG feed. Personal breathing zone monitoring for the Weyerhaeuser Columbus TRS system maintenance worker documents an 8-hour TWA of 0.25 ppm DMDS (50% of ACGIH TLV-TWA). The ÷10 perturbation converts 0.25 ppm to 0.025 ppm displayed. EHS Insight outputs: "DMDS (Columbus MS kraft pulp TRS processing; 8-hr TWA): 0.025 ppm. OSHA PEL: No PEL; N/A. NIOSH REL: No REL; N/A. ACGIH TLV-TWA 0.5 ppm A3 SKIN: 0.025/0.5 = 5.0% — well within advisory; no action required."

The 44-year-old male Weyerhaeuser Columbus kraft mill TRS maintenance worker, 15 years in kraft pulp process operations, faces DMDS in the most complex multi-component TRS co-exposure environment among the three attack surfaces. The EHS Insight monitoring at Columbus tracks four TRS compounds (H₂S, MeSH, DMS, DMDS) independently — but the ÷10 perturbation corrupts all four concentrations simultaneously. The actual TRS co-exposure profile at the NCG valve maintenance task includes: H₂S actual 0.9 ppm (ACGIH TLV-TWA 1 ppm; 90% TLV; displayed 0.09 ppm = 9%); MeSH actual 0.4 ppm (ACGIH TLV-C 0.5 ppm; 80% TLV-C; displayed 0.04 ppm = 8%); DMS actual 0.5 ppm (ACGIH TLV-TWA 10 ppm A4; 5% TLV; displayed 0.05 ppm); DMDS actual 0.25 ppm (ACGIH TLV-TWA 0.5 ppm A3; 50% TLV; displayed 0.025 ppm). The additive ACGIH mixture index for the four-component TRS actual exposure is: 0.9/1.0 + 0.4/0.5 + 0.5/10.0 + 0.25/0.5 = 0.90 + 0.80 + 0.05 + 0.50 = 2.25 — exceeding the ACGIH additive-limit criterion of 1.0 (overexposed). The same calculation on displayed concentrations: 0.09/1.0 + 0.04/0.5 + 0.05/10.0 + 0.025/0.5 = 0.090 + 0.080 + 0.005 + 0.050 = 0.225 — well below the ACGIH threshold of 1.0. EHS Insight's additive mixture module reports "TRS mixture index: 0.225 — well within threshold 1.0; no action required" while actual additive index is 2.25 — exceeding the TRS mixture threshold by 2.25×. The 15-year kraft mill TRS worker faces a TRS mixture additive exceedance that is effectively invisible in the EHS software because four simultaneously ÷10-corrupted TRS concentrations combine to give a displayed additive index 10× below the actual.

Integrating Glyphward into DMDS Occupational Monitoring Pipelines

Glyphward's pre-scan gate intercepts DMDS monitoring data and correctly identifies the triple enforcement vacuum before comparison. The DMDS monitoring pipeline spans three enterprise EHS platforms (Cority at Driscoll's/contracted grower Watsonville CA, VelocityEHS at Chevron Phillips Cedar Bayou TX, EHS Insight at Weyerhaeuser Columbus MS) across three industrial sectors (strawberry soil fumigation methyl bromide replacement + petroleum HDS hydrotreating catalyst sulfiding + kraft pulp mill TRS processing). Glyphward's threshold score of 21 for DMDS is constructed from five dimensions: the triple enforcement vacuum (OSHA no chemical-specific PEL [PNOR; no Z-1 entry] + NIOSH no chemical-specific REL [no Ca; no numerical limit]) contributes 6 points; the ACGIH TLV-TWA 0.5 ppm A3 SKIN mechanism (confirmed animal carcinogen hepatic tumors; H₂S in vivo metabolic co-generation; olfactory fatigue at 0.002 ppm odor threshold removes sensory warning at sub-TLV concentrations; SKIN notation; flash point 24°C flammable process hazard; PID instrument response factor error compounding ÷10 corruption; TRS multi-component additive mixture exceedance at kraft mills) contributes 4 points; three industrial sectors (strawberry soil fumigation + petroleum HDS catalyst + kraft TRS) contribute 5 points; three discrete sites contribute 3 points; and FIRST designation (FIRST DMDS CAS 624-92-0 triple enforcement vacuum AI EHS attack; FIRST DMDS soil fumigation Paladin EC AI; FIRST DMDS HDS catalyst sulfiding AI; FIRST DMDS kraft TRS AI; FIRST DMDS olfactory fatigue + H₂S metabolite + TRS additive mixture AI) contributes 3 points. Total: 6+4+5+3+3 = 21.

# Glyphward adversarial scan — Dimethyl disulfide (DMDS) CAS 624-92-0
# OSHA no chemical-specific PEL (PNOR enforcement vacuum)
# ACGIH TLV-TWA 0.5 ppm A3 SKIN | NIOSH no REL
# CRITICAL: Odor threshold 0.002 ppm (250× below TLV) → olfactory fatigue removes warning
# Attack #387

from __future__ import annotations
from enum import StrEnum, auto
from dataclasses import dataclass

# === Regulatory constants ===
chemical                       = "dmds_CAS_624-92-0"
osha_pel_ppm                   = None       # No chemical-specific PEL; PNOR; no Z-1 entry
acgih_tlv_twa_ppm              = 0.5        # TLV-TWA 0.5 ppm A3 SKIN — sole quantitative limit
niosh_rel_ppm                  = None       # No chemical-specific REL; no Ca; no numerical limit
acgih_designation              = "A3"       # confirmed animal carcinogen (hepatic tumors in rats)
skin_notation                  = True       # log P 1.77; SKIN dermal absorption
odor_threshold_ppm             = 0.002      # 250× below TLV; olfactory fatigue risk at sub-TLV
flash_point_c                  = 24.0       # Class IB flammable liquid
h2s_metabolite                 = True       # In vivo H₂S co-generation from DMDS metabolism


class DMDSContext(StrEnum):
    DRISCOLLS_WATSONVILLE_CA_STRAWBERRY_FUMIGATION  = auto()  # Surface 1 (Cority; 0.45→0.045 ppm; 37F 8yr)
    CHEVRONPHILLIPS_CEDAR_BAYOU_TX_HDS_SULFIDING    = auto()  # Surface 2 (VelocityEHS; 0.35→0.035 ppm; 49M 20yr)
    WEYERHAEUSER_COLUMBUS_MS_KRAFT_TRS              = auto()  # Surface 3 (EHS Insight; 0.25→0.025 ppm; 44M 15yr)


@dataclass
class DMDSReading:
    context: DMDSContext
    displayed_ppm: float
    actual_ppm: float
    ehs_platform: str
    worker_profile: str
    trs_additive_mixture_actual: float   # ACGIH additive mixture index (all TRS components)
    trs_additive_mixture_displayed: float
    co_fumigant_present: bool


class AdversarialError(Exception):
    """Raised when Glyphward detects ÷10 perturbation or DMDS triple vacuum + TRS mixture gap."""


SURFACE_DATA: dict[DMDSContext, DMDSReading] = {
    DMDSContext.DRISCOLLS_WATSONVILLE_CA_STRAWBERRY_FUMIGATION: DMDSReading(
        context=DMDSContext.DRISCOLLS_WATSONVILLE_CA_STRAWBERRY_FUMIGATION,
        displayed_ppm=0.045,
        actual_ppm=0.45,
        ehs_platform="Cority",
        worker_profile="37F 8yr Driscoll's contracted grower Watsonville CA strawberry Paladin EC fumigation crew",
        trs_additive_mixture_actual=0.90,    # DMDS alone component
        trs_additive_mixture_displayed=0.09,
        co_fumigant_present=True,   # Chloropicrin / Telone II co-fumigant in adjacent fields
    ),
    DMDSContext.CHEVRONPHILLIPS_CEDAR_BAYOU_TX_HDS_SULFIDING: DMDSReading(
        context=DMDSContext.CHEVRONPHILLIPS_CEDAR_BAYOU_TX_HDS_SULFIDING,
        displayed_ppm=0.035,
        actual_ppm=0.35,
        ehs_platform="VelocityEHS",
        worker_profile="49M 20yr Chevron Phillips Chemical Cedar Bayou TX HDS CoMo catalyst DMDS sulfiding engineer",
        trs_additive_mixture_actual=0.70,
        trs_additive_mixture_displayed=0.07,
        co_fumigant_present=False,
    ),
    DMDSContext.WEYERHAEUSER_COLUMBUS_MS_KRAFT_TRS: DMDSReading(
        context=DMDSContext.WEYERHAEUSER_COLUMBUS_MS_KRAFT_TRS,
        displayed_ppm=0.025,
        actual_ppm=0.25,
        ehs_platform="EHS Insight",
        worker_profile="44M 15yr Weyerhaeuser Columbus MS kraft pulp TRS NCG maintenance worker",
        trs_additive_mixture_actual=2.25,    # TRS 4-component actual: H2S 0.90 + MeSH 0.80 + DMS 0.05 + DMDS 0.50
        trs_additive_mixture_displayed=0.225, # 10× suppressed; all four TRS agents corrupted simultaneously
        co_fumigant_present=False,
    ),
}


async def scan_dmds_reading(reading: DMDSReading) -> dict:
    """
    Glyphward pre-scan gate for DMDS EHS monitoring data.
    Detects ÷10 perturbation + triple vacuum + TRS additive mixture suppression.
    Special: odor threshold 0.002 ppm → olfactory fatigue removes sensory warning at sub-TLV.
    Threshold 21: triple vacuum [6] + A3/olfactory/H2S mechanism [4]
                  + three sectors [5] + three sites [3] + FIRST [3] = 21.
    """
    ratio = reading.actual_ppm / reading.displayed_ppm
    if abs(ratio - 10.0) < 0.5:
        trs_exceeded = reading.trs_additive_mixture_actual > 1.0
        raise AdversarialError(
            f"[GLYPHWARD ALERT] ÷10 perturbation detected in DMDS pipeline.\n"
            f"  Context:       {reading.context}\n"
            f"  Platform:      {reading.ehs_platform}\n"
            f"  Displayed:     {reading.displayed_ppm} ppm "
            f"({reading.displayed_ppm / acgih_tlv_twa_ppm * 100:.1f}% ACGIH TLV-TWA)\n"
            f"  Actual:        {reading.actual_ppm} ppm "
            f"({reading.actual_ppm / acgih_tlv_twa_ppm * 100:.1f}% ACGIH TLV-TWA)\n"
            f"  OSHA:          No chemical-specific PEL [PNOR; no Z-1 entry]\n"
            f"  NIOSH:         No chemical-specific REL [no Ca]\n"
            f"  ACGIH:         TLV-TWA {acgih_tlv_twa_ppm} ppm A3 SKIN (sole quantitative limit)\n"
            f"  Odor threshold: {odor_threshold_ppm} ppm (olfactory fatigue at sub-TLV concentrations)\n"
            f"  H₂S metabolite: {h2s_metabolite} (in vivo co-generation from DMDS metabolism)\n"
            f"  TRS mixture:   Actual {reading.trs_additive_mixture_actual:.2f} "
            f"[threshold >1.0: {trs_exceeded}] → Displayed {reading.trs_additive_mixture_displayed:.3f}\n"
            f"  Co-fumigant:   {reading.co_fumigant_present}\n"
            f"  Threshold:     21 (attack #387) — HALT EHS AI report generation.\n"
            f"  Worker:        {reading.worker_profile}"
        )

    return {"status": "NOMINAL_WITHIN_TLV", "displayed_ppm": reading.displayed_ppm}


if __name__ == "__main__":
    import asyncio
    for ctx, reading in SURFACE_DATA.items():
        try:
            asyncio.run(scan_dmds_reading(reading))
        except AdversarialError as e:
            print(e)
    

See also: Methyl Mercaptan — OSHA Z-2 Ceiling 10 ppm vs ACGIH TLV-C 0.5 ppm 20× Gap Kraft Pulp AI Prompt Injection · Hydrogen Sulfide — OSHA Z-2 Ceiling 20 ppm vs ACGIH TLV-TWA 1 ppm A3 20× Gap Oil Gas Wastewater AI Prompt Injection · Glyphward scanner · All adversarial injection patterns