Ozone 8-hour 4th-highest daily max
Ozone 8-hour 4th-highest daily max in St. Mary Parish County reached 0.088 ppm in 2010, 26% above the EPA NAAQS of 0.07 ppm.
County · TRI 2024
St. Mary Parish, Louisiana Pollution
10 top TRI facilities tracked here. Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) held roughly steady year over year (—). Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
FIPS 22101 · population 49,114
Multi-year history not yet ingested.
Anomaly engine
Notable Signals
Total TRI releases
Total TRI releases at St. Mary Parish County have risen 61% since 2010 (through 2024).
Top facilities mapped
Where Chemicals Are Released In St. Mary Parish
Each red dot is one of the top TRI facilities. Size reflects 2024 total releases. County boundary outlined in blue.
Pollutant pathways
St. Mary Parish Pollutant Multi-Year Trends
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour))Health riskGround-level ozone (smog) forms when vehicle and industrial emissions react in sunlight. Inflames the airways, triggers asthma attacks, and worsens heart and lung disease.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Lifetime cancer risk all pollutants (100 in a million (EPA elevated threshold))Health riskEPA-modeled added cancer cases per million residents from a lifetime of breathing local air toxics. EPA flags 100-in-a-million as elevated.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Formaldehyde ambient mean (0.077 µg/m³ (1-in-a-million URE))Health riskAn air toxic emitted by refineries, wood products, and combustion. EPA classifies it as a known human carcinogen — long-term inhalation raises cancer risk.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Benzene ambient mean (0.13 µg/m³ (1-in-a-million URE))Health riskAn air toxic from gasoline, refineries, and tobacco smoke. A known human carcinogen — chronic exposure is linked to leukemia and other blood cancers.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
TRI air releases (5.1 fugitive + 5.2 stack)Health riskToxic chemicals reported by industrial facilities as released into the air — fugitive leaks plus smokestack emissions. Higher pounds means more inhaled exposure for nearby residents.
TRI air releases (5.1 fugitive + 5.2 stack) concentrations are up 57% since 2010.
TRI water releases (5.3)Health riskToxic chemicals reported by industrial facilities as discharged to surface waters (rivers, lakes, the ocean). Affects fishing, recreation, and downstream drinking-water intakes.
TRI water releases (5.3) volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
TRI land + off-site releasesHealth riskToxic chemicals released to land on-site or transferred off-site for disposal — landfills, deep-well injection, and similar. Risks groundwater contamination over time.
TRI land + off-site releases concentrations have more than doubled since 2010.
Greenhouse gases (GHGRP large emitters, through 2023)Health riskGreenhouse gases reported by large industrial emitters under EPA's GHGRP, in metric tons of CO₂ equivalent. Drives climate warming and the heat-related health effects that follow.
Greenhouse gases (GHGRP large emitters, through 2023) concentrations have fallen 44% since 2010.
Top facilities · 2024
Where The Chemical Releases Are Concentrated
| Facility | City | Top chemical | Total releases | YoY |
|---|---|---|---|---|
| Cabot Corp Canal PlantCabot CORP | Centerville | Hydrogen sulfideHealth riskAcutely toxic at high concentrations (paralyzes the olfactory nerve, then respiratory failure); chronic low-level exposure causes eye and respiratory irritation. (NIOSH) | 585k lb | -6% |
| Bollinger Marine Fabricators LLCBollinger Shipyards LLC | Amelia | PropyleneHealth riskSimple asphyxiant; low direct toxicity at typical exposure levels. (NIOSH) | 133k lb | -39% |
| Conrad Shipyard LLC (Deepwater Yard)Conrad Industries INC | Morgan City | Xylene (mixed isomers)Health riskEye, skin, and respiratory irritant; central-nervous-system effects from chronic exposure. (EPA) | 48k lb | +2798% |
| Orion Engineered Carbons-Ivanhoe Carbon Black PlantOrion Engineered Carbons LLC | Franklin | AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA) | 47k lb | -60% |
| Birla Carbon USA INCAditya Birla Group | Centerville | Hydrogen sulfideHealth riskAcutely toxic at high concentrations (paralyzes the olfactory nerve, then respiratory failure); chronic low-level exposure causes eye and respiratory irritation. (NIOSH) | 41k lb | +22% |
| Cameron International CorpSchlumberger Holdings CORP | Bayou Vista | Ethylene glycolHealth riskAcutely toxic if ingested. Metabolizes to compounds that cause kidney failure. (EPA) | 29k lb | -6% |
| Cameron International CorpSchlumberger Holdings CORP | Patterson | Ethylene glycolHealth riskAcutely toxic if ingested. Metabolizes to compounds that cause kidney failure. (EPA) | 25k lb | -17% |
| Enterprise Gas Processing LLC - Neptune Gas PlantEnterprise Products Operating LLC | Centerville | BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA) | 6k lb | +135% |
| Pelican Processing PlantEnlink Midstream Operating LP | Patterson | n-HexaneHealth riskPeripheral neurotoxin. Chronic exposure causes numbness and paralysis in the extremities. (ATSDR) | 4k lb | +1% |
| New Industries LLC | Morgan City | Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR) | 118 lb | -4% |
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Who Lives In St. Mary Parish
All block groups in St. Mary Parish County, LA: 49,114 residents. County disparity score for pm2.5 (fine particulate) sits below the reference (55). Why we surface this →
21.9%
Low-income
44.2%
People of color
6.0%
Under age 5
17.6%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.29below the national median
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.44near the national median
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.26below the national median
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.34below the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.56near the national median
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.11below the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.58near the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.56near the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.70above the national median
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.46near the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.62above the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.55near the national median
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.89in the highest 20% nationally
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 55 | below the reference |
| Ozone | 22 | well below the reference |
| Nitrogen dioxide (NO₂) | 50 | below the reference |
| Diesel particulate | 62 | below the reference |
| Toxic releases (RSEI) | 76 | below the reference |
| Traffic proximity | 22 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 88 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 96 | near the reference |
| Hazardous-waste site proximity | 57 | below the reference |
| Underground storage tanks | 82 | below the reference |
| NPDES wastewater proximity | 67 | below the reference |
| Drinking-water non-compliance | 68 | below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror).
Health context
Co-Located Health Indicators
Modeled adult-prevalence estimates published by CDC PLACES, paired with this county's pollution and demographic context. Comparisons are ecological, not causal — pollution and disease prevalence covary at the area level, but the data does not attribute any individual's diagnosis to local exposure. How this section works →
Adult asthma (current)
10.7%
CDC PLACES · 2025 release · BRFSS 2022-2023
COPD prevalence
10.8%
CDC PLACES · 2025 release · BRFSS 2022-2023
Coronary heart disease
9.2%
CDC PLACES · 2025 release · BRFSS 2022-2023
Diabetes (diagnosed)
18.1%
CDC PLACES · 2025 release · BRFSS 2022-2023
Frequent mental distress
20.4%
CDC PLACES · 2025 release · BRFSS 2022-2023
PLACES uses BRFSS-modeled small-area estimates, not individual records. Crude prevalence shown above is the local rate as published; comparators are age-adjusted vs the Louisiana mean and the US mean — both population-weighted across counties — so geographies with different age structures stay apples-to-apples. Sources: CDC PLACES · 2025 release · BRFSS 2022-2023.
Browse
All 8 St. Mary Parish Cities With TRI Data
Pollution trends and TRI 2024 pages for every tracked city in this county. Alphabetical.
Sources.
- EPA Toxics Release Inventory · retrieved 2026-05-07.
All sources are federal public-domain datasets under 17 USC §105. We aggregate but do not relabel; the underlying observations remain attributable to EPA.