Pollution Analyst
How it works→
County · TRI 2024

Los Angeles County, California Pollution

10 top TRI facilities tracked here. PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) rose modestly year over year (+14%). PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have fallen 46% since 2010.

FIPS 06037 · population 9,936,690

See top facilities PathwaysEquity context
PM2.5 ANNUAL MEAN (NAAQS 9 ΜG/M³ (ANNUAL)) · 2010–2024
Bar chart of annual values from 2010 to 2024, in µg/m³. Most recent year (2024): 11 µg/m³.20 µg/m³'10'12'14'16'18'20'22'2411 µg/m³
Anomaly engine

Notable Signals

NAAQS EXCEEDANCE · AIR QUALITY · NAAQS

PM2.5 annual mean

PM2.5 annual mean in Los Angeles County reached 10.9 µg/m³ in 2024, 21% above the EPA NAAQS of 9 µg/m³.

NAAQS EXCEEDANCE · AIR QUALITY · NAAQS

Ozone 8-hour 4th-highest daily max

Ozone 8-hour 4th-highest daily max in Los Angeles County reached 0.082 ppm in 2024, 17% above the EPA NAAQS of 0.07 ppm.

Top facilities mapped

Where Chemicals Are Released In Los Angeles County

Each red dot is one of the top TRI facilities. Size reflects 2024 total releases. County boundary outlined in blue.

STYLE10 TRI facilities · Los Angeles County
Pollutant pathways

Los Angeles County Pollutant Multi-Year Trends

CRITERIA AIRSINCE 2010

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.

10.86 µg/m³ · +14% YoY · -46% since 2010

PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have fallen 46% since 2010.

CRITERIA AIRSINCE 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.

31.81 µg/m³ · +46% YoY · -47% since 2010

PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have fallen 47% since 2010.

CRITERIA AIRSINCE 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.

0.082 ppm · +1% YoY · -5% since 2010

Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations are roughly unchanged from 2010.

CRITERIA AIRSINCE 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.

12.3 ppb · +4% YoY · -62% since 2010

NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations have more than halved since 2010.

HAZARDOUS AIR2020 VINTAGE

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.

39.6 per million · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

HAZARDOUS AIR2020 VINTAGE

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.

1.91 µg/m³ · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

HAZARDOUS AIR2020 VINTAGE

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.

0.34 µg/m³ · 2020 vintage

Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.

TRI AIRSINCE 2010

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.

2.2M lb · +0% YoY · -18% since 2010

TRI air releases (5.1 fugitive + 5.2 stack) concentrations have fallen 18% since 2010.

TRI WATERSINCE 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.

1.7M lb · +0% YoY · +116% since 2010

TRI water releases (5.3) concentrations have more than doubled since 2010.

TRI LANDSINCE 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.

4.5M lb · -4% YoY · +105% since 2010

TRI land + off-site releases concentrations have more than doubled since 2010.

GHGSINCE 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.

203.2M metric tons CO₂e · -4% YoY · +18% since 2010

Greenhouse gases (GHGRP large emitters, through 2023) concentrations are up 18% since 2010.

Top facilities · 2024

Where The Chemical Releases Are Concentrated

FacilityCityTop chemicalTotal releasesYoY
Chevron Products CO. Div Of Chevron USA INC.Chevron CORPEl SegundoNitrate 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)1.9M lb-7%
Ecobat Resources California INC.Ecobat LLCCity Of IndustryLead And Lead CompoundsHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)1.8M lb-12%
Tesoro Los Angeles Refinery-Carson OperationsMarathon Petroleum CORPCarsonAmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA)1.0M lb+7%
Clean Harbors Wilmington LLCClean Harbors INCWilmingtonLead And Lead CompoundsHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)334k lb+304%
Berg Lacquer COBerg Lacquer CoLos AngelesMethanolHealth riskAcutely toxic if ingested or inhaled. Metabolizes to formaldehyde and formic acid, causing blindness and metabolic acidosis. (EPA)316k lb+67%
Torrance Refining CO LLCPbf Energy INCTorranceHydrogen cyanideHealth riskAcutely lethal at high doses by blocking cellular respiration; chronic low-dose exposure damages the thyroid and nervous system. (EPA, ATSDR)294k lb+22%
Phillips 66 Los Angeles Refinery Wilmington PlantPhillips 66 CoWilmingtonHydrogen cyanideHealth riskAcutely lethal at high doses by blocking cellular respiration; chronic low-dose exposure damages the thyroid and nervous system. (EPA, ATSDR)274k lb-4%
M. Argueso & CO. INC.Paramelt USARosemead4,4'-IsopropylidenediphenolHealth riskBisphenol A (BPA). Endocrine disruptor that mimics estrogen; regulated for use in food contact and infant products. (EPA, FDA)255k lb-2%
Alloys Cleaning INCLos AngelesNitrate 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)221k lb+14411%
George IndustriesValmont Industries INCLos AngelesNitrate 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)201k lb+900%
Superfund / NPL sites

Federal Cleanup Sites In Los Angeles 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.

Methodology →

SiteCityStatusFederal facilityPrimary contaminant
Cooper Drum Co.South GateNPL FINALNo1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR)
Del AmoLos AngelesNPL FINALNoBenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)
Jervis B. Webb Co.South GateNPL FINALNo1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR)
Jet Propulsion Laboratory (Nasa)PasadenaNPL FINALFEDERALCarbon TetrachlorideHealth riskIARC Group 2B possible carcinogen; liver toxic. EPA MCL 5 µg/L. Banned for most uses since 1986. (IARC, EPA)
Montrose Chemical Corp.TorranceNPL FINALNoChlorobenzene
Omega Chemical CorporationWhittierNPL FINALNo1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR)
Operating Industries, Inc., LandfillMonterey ParkNPL FINALNoChloroethene (Vinyl Chloride)Health riskIARC Group 1 carcinogen — angiosarcoma of the liver. Final TCE/PCE biodegradation product; commonly found in groundwater plumes. EPA MCL 2 µg/L. (IARC, EPA)
Pemaco MaywoodBellNPL FINALNo1,1,2-Trichloroethane
San Fernando Valley (Area 1)BurbankNPL FINALNoTetrachloroetheneHealth riskPCE / 'perc'. IARC Group 2A probable carcinogen; central-nervous-system effects; common dry-cleaning solvent and DNAPL plume contaminant. EPA MCL 5 µg/L. (IARC, EPA)
San Fernando Valley (Area 2)GlendaleNPL FINALNo1,1,2,2-Tetrachloroethane

Showing the top 10 sites by status priority. 9 additional NPL-relevant sites in Los Angeles County have entity pages — browse them via the host-county or host-city page rollups.

Equity context · ACS 2018-2022 · USEPA-clone EJ disparity

Who Lives In Los Angeles County

All block groups in Los Angeles County County, CA: 9,936,690 residents. County disparity score for pm2.5 (fine particulate) sits well above the reference burden (180). Why we surface this →

POPULATION SHARE
13.7%

Low-income

POPULATION SHARE
74.8%

People of color

POPULATION SHARE
5.6%

Under age 5

POPULATION SHARE
14.2%

Over age 64

NATIONAL PERCENTILE · vs all US block groups (population-weighted; ranked against the national EJScreen indicator distribution)

  • 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.94in the highest 10% nationally
  • OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.97in the highest 5% nationally
  • 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.83in the highest 20% nationally
  • 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.93in the highest 10% nationally
  • 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.70above 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.95in the highest 10% nationally
  • 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.76above 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.94in the highest 10% nationally
  • 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.90in 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.96in the highest 5% nationally
  • 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.28below 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.90in the highest 20% nationally
  • 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.77above the national median
EJ disparity scores · population-weighted across county block groups (100 = national reference; higher = greater disparate burden)
IndicatorDisparity scoreReading
PM2.5 (fine particulate)180well above the reference burden
Ozone165well above the reference burden
Nitrogen dioxide (NO₂)157well above the reference burden
Diesel particulate169well above the reference burden
Toxic releases (RSEI)122moderately above the reference
Traffic proximity174well above the reference burden
Lead-paint risk (pre-1960 housing)128moderately above the reference
Superfund site proximity130moderately above the reference
RMP-facility proximity148moderately above the reference
Hazardous-waste site proximity181well above the reference burden
Underground storage tanks0well below the reference
NPDES wastewater proximity145moderately above the reference
Drinking-water non-compliance3well 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)

BRFSS 2023
9.1%
-3% vs California mean-10% vs US mean

CDC PLACES · 2025 release · BRFSS 2022-2023

COPD prevalence

BRFSS 2023
4.9%
-3% vs California mean-18% vs US mean

CDC PLACES · 2025 release · BRFSS 2022-2023

Coronary heart disease

BRFSS 2023
5.3%
-3% vs California mean-10% vs US mean

CDC PLACES · 2025 release · BRFSS 2022-2023

Diabetes (diagnosed)

BRFSS 2023
12.6%
+8% vs California mean+11% vs US mean

CDC PLACES · 2025 release · BRFSS 2022-2023

Frequent mental distress

BRFSS 2023
16.2%
-2% vs California mean-1% vs US mean

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 California 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 81 Los Angeles County Cities With TRI Data

Pollution trends and TRI 2024 pages for every tracked city in this county. Alphabetical.

Sources.

All sources are federal public-domain datasets under 17 USC §105. We aggregate but do not relabel; the underlying observations remain attributable to EPA.