Power Plants and Community Health: Coal, Gas, and the Transition to Clean Energy

The phrase "power plant" summons a specific image: cooling towers, smokestacks, the hum of turbines. What it should also summon — but rarely does for most people — is a precise inventory of what those smokestacks are releasing and who is breathing it.

Coal-fired power plants are the largest stationary source of mercury air emissions in the United States, and among the largest sources of PM2.5, nitrogen oxides, and sulfur dioxide. Natural gas plants, marketed as a "clean" alternative to coal, emit significantly less PM2.5 and virtually no mercury or sulfur — but they are not emission-free, and their methane leakage during extraction and transmission has climate consequences that dwarf their direct local air quality effects.

The transition from coal to natural gas, and increasingly to wind, solar, and other renewable sources, is simultaneously the most important long-term public health intervention in American energy policy and one of the largest ongoing environmental justice challenges — because the communities living nearest to fossil fuel plants, which are disproportionately low-income and non-white, are the primary beneficiaries of that transition, and are often the last to see their local facilities retired.

A Harvard School of Public Health study published in 2021 estimated that air pollution from fossil fuel combustion — primarily from power plants and vehicles — causes approximately 350,000 premature deaths in the United States annually. The leading mechanism is PM2.5-mediated cardiovascular and respiratory disease.

Power plants are a subset of this total. A study by Henneman and colleagues tracked individual power plant emissions and their geographic dispersion, linking specific plant emissions to specific health outcomes in downwind counties. Their findings: • A small fraction of US coal plants are responsible for a disproportionate share of the health burden — the oldest, largest, and least-equipped-with-pollution-controls facilities • The health damage from coal plant emissions is concentrated in communities within 200–300 km downwind, often crossing state lines in ways that create regulatory accountability gaps

The mercury pathway Coal plant mercury — emitted as elemental mercury vapor and as particulate-bound mercury — deposits in watersheds, where anaerobic bacteria convert it to methylmercury that bioaccumulates in fish. The fish-based dietary mercury exposure of communities that consume locally caught fish from coal-plant-affected watersheds represents the primary route by which power plant mercury reaches human bodies.

The 2012 Mercury and Air Toxics Standards (MATS) rule required coal plants to install scrubbers and other control equipment that has dramatically reduced mercury emissions — one of the most significant environmental health achievements of the Obama administration.

Power plants are not randomly distributed across the landscape. Their siting reflects decades of decisions that consistently placed them nearest to communities with the least political power to resist them.

Analysis of census data against power plant location consistently finds that census tracts within 5 km of fossil fuel power plants have higher proportions of Black, Latino, and low-income residents than census tracts further away. This pattern is particularly pronounced for coal plants and for the oldest, highest-emitting facilities.

The EJScreen analysis Running any operating coal or gas plant's address through EJScreen shows, in most cases, communities at higher-than-average percentiles for multiple environmental burden indicators and with demographic compositions more heavily minority and lower-income than state and national averages.

The transition equity question The clean energy transition creates an environmental justice opportunity and a risk simultaneously. The opportunity: retiring fossil fuel plants removes the largest stationary emission sources from communities that have borne the greatest burden. The risk: the economic disruption of plant retirement — job losses, reduced tax revenue, community economic decline — falls on the same communities if not managed through a just transition framework.

The Biden administration's Justice40 initiative committed 40% of federal clean energy investment benefits to disadvantaged communities. The practical implementation — ensuring that new solar, wind, and transmission infrastructure brings economic opportunity to communities that have hosted fossil fuel facilities — is the environmental justice work of the clean energy transition.

The air quality improvements already achieved from coal plant retirement — and the projected improvements from continued transition to clean energy — represent some of the most quantified and certain public health benefits in environmental health policy.

The documented benefits of coal plant retirement A 2022 study by Thakrar and colleagues found that retiring the most polluting US coal plants — the bottom quintile by health damage per unit of electricity — would prevent approximately 7,900 premature deaths per year. The benefit-to-cost ratio for meeting this goal was estimated at approximately 30:1.

Clean air has historically been undervalued in economic analyses because its benefits are diffuse and probabilistic — no individual can trace their avoided heart attack to a specific plant retirement. But the aggregate benefits are large, quantifiable, and disproportionately concentrated in the communities nearest the plants.

PollutionProfile's historical air quality tracking PollutionProfile's Air Quality feature tracks your current address's daily AQI. The Historical Exposure Recorder captures the air quality history at past addresses — including periods when you may have lived near a coal or gas facility that has since been retired or has had emissions controls upgraded.

Understanding the air quality trajectory at your address — whether it has been improving, stable, or declining — provides the context for interpreting your cumulative PM2.5 exposure history. The shift from coal to gas to renewables in the US electricity sector has produced measurable air quality improvements in many communities over the past two decades, and those improvements are captured in the historical data that your exposure report draws on.