Environmental Justice: Why Pollution Exposure Is Not Equally Distributed

In 1987, the United Church of Christ Commission for Racial Justice published a report called "Toxic Wastes and Race in the United States." It was the first systematic national analysis of the relationship between race and proximity to hazardous waste facilities. The finding was unambiguous: race was the most significant factor — more significant than income, more significant than property values — in determining whether a community hosted a commercial hazardous waste facility.

The report landed like a grenade. It documented what communities of colour in the American South, Midwest, and Southwest had been living with for decades: that industrial facilities, waste sites, refineries, and polluting infrastructure were concentrated in their neighbourhoods in ways that could not be explained by random chance or economics alone.

Thirty-five years later, the data has not changed direction. It has accumulated. Analysis after analysis, using better data and more sophisticated methods, reaches the same conclusion: in the United States, Black, Latino, Native American, and low-income communities bear a disproportionate share of environmental pollution burden — from air quality to water contamination to proximity to toxic waste — and the health consequences of that disproportionate burden are written in their disease rates and life expectancies.

This is not a contested fringe position. It is the consensus finding of environmental health epidemiology.

Environmental justice research has moved beyond documenting disparity to quantifying it precisely and identifying its mechanisms.

The air quality disparity A 2018 study in the American Journal of Public Health analysed EPA emissions data and found that non-white Americans are exposed to 1.28 times more particulate matter pollution from industrial sources than white Americans — a disparity that persists after controlling for income. A 2019 study in PNAS went further: it found that while white Americans cause more air pollution than they're exposed to (their consumption patterns generate emissions that fall disproportionately on others), Black and Latino Americans are exposed to more pollution than they generate.

Near-road and traffic proximity Studies in multiple US cities have found that low-income and minority communities are more likely to be located within 150 metres of a major road — the zone of highest traffic-related air pollution. This proximity effect is independent of city-level air quality: a city with relatively clean average air can still have sharp within-city disparities in who lives closest to the pollution sources.

The EPA's EJScreen tool EJScreen — the EPA's Environmental Justice Screening and Mapping Tool — combines environmental data (air quality, proximity to waste sites, water quality, traffic density) with demographic data (race, income, education, age) to generate cumulative environmental justice scores for any US census block. It's publicly available at epa.gov/ejscreen and allows anyone to see their community's pollution burden in the context of its demographic composition.

Living in a pollution hot spot is not a single-exposure problem. It is a cumulative burden — multiple overlapping pollution sources, affecting multiple health systems simultaneously, over an entire lifetime.

The concept of cumulative environmental burden is increasingly central to environmental justice research and regulation. A community near a highway, a power plant, and a chemical facility is not experiencing the sum of three independent risk factors — it may be experiencing something qualitatively different, because the biological pathways affected by multiple stressors interact.

The compounding health consequences Communities with the highest cumulative pollution burden — typically low-income communities of colour — show consistently higher rates of: • Asthma and other respiratory disease • Cardiovascular disease and mortality • Childhood lead poisoning • Cancer incidence, particularly for cancers with known environmental aetiology • Premature mortality from all causes

These disparities cannot be explained by individual lifestyle factors. They follow the geography of pollution, not the geography of personal behaviour.

The historical mechanisms The concentration of pollution in communities of colour did not happen by chance. It reflects specific historical decisions: the siting of highways through Black neighbourhoods during urban renewal, the location of industrial facilities in communities with less political power to resist them, the exclusion of minority communities from housing in less-polluted neighbourhoods through redlining and discriminatory real estate practices.

Regulatory response President Biden's Justice40 initiative committed that 40% of the benefits from federal climate and clean energy investments would flow to disadvantaged communities. The EPA has strengthened environmental justice considerations in permitting and enforcement. These are meaningful shifts — but the legacy of a century of inequitable siting decisions will take decades to reverse.

Understanding your community's environmental justice profile is both a personal health tool and a starting point for civic engagement.

Using EJScreen for your address Navigate to epa.gov/ejscreen, enter your address or ZIP code, and the tool generates a report showing: • Percentile rankings for individual environmental indicators (PM2.5, ozone, traffic proximity, proximity to hazardous waste, drinking water quality) • A composite EJ index score combining environmental and demographic indicators • Comparison to state and national percentiles

A community at the 90th percentile for the EJ index is experiencing more cumulative burden than 90% of the country. This context is valuable for understanding how your individual exposure history fits into the broader environmental landscape of your community.

Connecting to PollutionProfile PollutionProfile's Historical Exposure Recorder links your address history to environmental data — including Superfund proximity, air quality records, and water system compliance history — that overlaps significantly with the EJScreen data. Comparing the two tools gives a fuller picture: EJScreen provides community context; PollutionProfile provides individual history.

Civic dimensions If your community's EJScreen score reveals significant cumulative burden, that information is actionable at the community level as well as the individual level: • Environmental justice organisations in most cities work on facility permitting, enforcement, and land use decisions • The EPA's environmental justice complaint process allows community members to file complaints about disparate environmental impacts • State environmental agencies have environmental justice programmes and in many cases dedicated offices

Understanding your community's environmental justice profile is the foundation for both individual protective action and collective advocacy.