Ozone 8-hour 4th-highest daily max
Ozone 8-hour 4th-highest daily max in Brazoria County reached 0.071 ppm in 2024, 1% above the EPA NAAQS of 0.07 ppm.
County · TRI 2024
Brazoria County, Texas Pollution
10 top TRI facilities tracked here. PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) held roughly steady year over year (-0%). PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have fallen 22% since 2010.
FIPS 48039 · population 374,600
Anomaly engine
Notable Signals
Top facilities mapped
Where Chemicals Are Released In Brazoria County
Each red dot is one of the top TRI facilities. Size reflects 2024 total releases. County boundary outlined in blue.
Pollutant pathways
Brazoria County Pollutant Multi-Year Trends
PM2.5 annual mean (NAAQS 9 µg/m³ (annual))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.
PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have fallen 22% since 2010.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour))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.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have fallen 23% since 2010.
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.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations have fallen 10% since 2010.
NO₂ annual mean (NAAQS 53 ppb (annual))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.
NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations are roughly unchanged from 2011.
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 have fallen 30% 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) concentrations are roughly unchanged from 2010.
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 fallen 29% 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 are roughly unchanged from 2010.
Top facilities · 2024
Where The Chemical Releases Are Concentrated
| Facility | City | Top chemical | Total releases | YoY |
|---|---|---|---|---|
| Ascend Performance Materials-Chocolate Bayou PlantAscend Performance Materials Holdings INC | Alvin | AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA) | 18.7M lb | +1% |
| Basf Corp - Freeport SiteBasf CORP | Freeport | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) | 1.4M lb | -2% |
| Phillips 66 CO Sweeny Refinery ComplexPhillips 66 Co | Old Ocean | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) | 911k lb | -1% |
| Dow Chemical CO Freeport FacilityDow INC | Freeport | EthyleneHealth riskSimple asphyxiant at high concentrations; precursor to many polymers; low direct toxicity. (NIOSH) | 883k lb | +10% |
| Ineos USA LLC - Chocolate Bayou PlantIneos US I INC | Alvin | EthyleneHealth riskSimple asphyxiant at high concentrations; precursor to many polymers; low direct toxicity. (NIOSH) | 837k lb | +26% |
| Chevron Phillips Chemical CO LP Sweeny ComplexChevron Phillips Chemical Co LLC | Sweeny | EthyleneHealth riskSimple asphyxiant at high concentrations; precursor to many polymers; low direct toxicity. (NIOSH) | 414k lb | -3% |
| Freeport_Olin BcOlin CORP | Freeport | DichloromethaneHealth riskIARC Group 2A probable carcinogen; central-nervous-system depressant; banned for most consumer paint-stripper uses. (IARC, EPA) | 337k lb | +44% |
| Meglobal Oyster CreekMeglobal Americas INC | Freeport | Ethylene glycolHealth riskAcutely toxic if ingested. Metabolizes to compounds that cause kidney failure. (EPA) | 171k lb | -58% |
| Riviana Foods INC.Riviana Foods INC | Freeport | Sulfuryl fluorideHealth riskAcutely toxic by inhalation; potent greenhouse gas. (EPA) | 86k lb | +2% |
| Braskem America INC. Oyster Creek PlantBraskem America INC | Freeport | PropyleneHealth riskSimple asphyxiant; low direct toxicity at typical exposure levels. (NIOSH) | 81k lb | +26% |
Superfund / NPL sites
Federal Cleanup Sites In Brazoria County
Sites on EPA's Superfund National Priorities List, plus deleted sites whose cleanup objectives EPA has finalized. Federal-facility sites (defense, DOE, etc.) are flagged separately. Each link routes to a per-site page.
| Site | City | Status | Federal facility | Primary contaminant |
|---|---|---|---|---|
| Gulfco Marine Maintenance | Freeport | NPL FINAL | No | 1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR) |
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Who Lives In Brazoria County
All block groups in Brazoria County County, TX: 374,600 residents. County disparity score for pm2.5 (fine particulate) sits moderately above the reference (113). Why we surface this →
7.5%
Low-income
56.4%
People of color
7.3%
Under age 5
12.2%
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.82in the highest 20% nationally
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.73above 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.40below 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.40near 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.98in the highest 5% nationally
- 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.32below 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.38below 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.80in the highest 20% nationally
- 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.50near 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.59near 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.76above 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.85in the highest 20% nationally
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 113 | moderately above the reference |
| Ozone | 20 | well below the reference |
| Nitrogen dioxide (NO₂) | 55 | below the reference |
| Diesel particulate | 56 | below the reference |
| Toxic releases (RSEI) | 131 | moderately above the reference |
| Traffic proximity | 43 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 30 | well below the reference |
| Superfund site proximity | 9 | well below the reference |
| RMP-facility proximity | 91 | near the reference |
| Hazardous-waste site proximity | 59 | below the reference |
| Underground storage tanks | 66 | below the reference |
| NPDES wastewater proximity | 72 | below the reference |
| Drinking-water non-compliance | 73 | 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)
9.4%
CDC PLACES · 2025 release · BRFSS 2022-2023
COPD prevalence
5.1%
CDC PLACES · 2025 release · BRFSS 2022-2023
Coronary heart disease
5.1%
CDC PLACES · 2025 release · BRFSS 2022-2023
Diabetes (diagnosed)
12.0%
CDC PLACES · 2025 release · BRFSS 2022-2023
Frequent mental distress
16.1%
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 Texas 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 19 Brazoria County Cities With TRI Data
Pollution trends and TRI 2024 pages for every tracked city in this county. Alphabetical.
- Alvin pollution· 4 facilities
- Angleton pollution· 0 facilities
- Brazoria pollution· 0 facilities
- Clute pollution· 0 facilities
- Damon pollution· 0 facilities
- Danbury pollution· 0 facilities
- Freeport pollution· 13 facilities
- Holiday Lakes pollution· 0 facilities
- Lake Jackson pollution· 3 facilities
- Liverpool pollution· 1 facility
- Manvel pollution· 2 facilities
- Oyster Creek pollution· 0 facilities
- Pearland pollution· 6 facilities
- Quintana pollution· 1 facility
- Richwood pollution· 0 facilities
- Rosharon pollution· 0 facilities
- Surfside Beach pollution· 0 facilities
- Sweeny pollution· 0 facilities
- West Columbia pollution· 0 facilities
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.