Allegheny County just earned straight Fs from the American Lung Association’s latest "State of the Air" report, failing every pollution test the group uses to grade counties. That verdict leaves people across Pittsburgh and the Mon Valley facing elevated levels of both fine particle pollution (soot) and ground-level ozone on high-pollution days. The Pittsburgh–Weirton–Steubenville metro also shows up among the nation’s worst regions for year-round particle pollution.
According to Axios, the analysis is based on readings from local air monitors and ranks the metro No. 16 nationally for worst annual particle pollution and No. 63 for high-ozone days. Axios also reports that roughly 44% of Americans live in places that received failing grades for unhealthy levels of ozone or particle pollution.
How the report measures air quality
The American Lung Association scores communities on three measures - high-ozone days, short-term spikes in particle pollution, and the annual particle average - using quality-assured monitoring data from 2022 to 2024. In its full tables, the group lists Allegheny County among 20 counties that received failing grades across all three measures, according to the ALA report.
Local drivers and context
Longstanding industrial sites and heavy traffic help fuel the region’s particle burden. Watchdog group Group Against Smog & Pollution points to the U.S. Steel Clairton coke works and recurring monitor spikes in the Mon Valley as chronic trouble spots. Nationally, the EPA notes that ground-level ozone forms when vehicle and industrial emissions react in sunlight, a problem made worse in recent years by hotter summers and smoke from wildfires.
Health stakes
The Lung Association says 33.5 million children live in areas that earned failing grades for at least one pollutant, and roughly 152 million people, about 44% of the U.S. population, live in counties with at least one F grade, figures the group published with the report. The ALA links both ozone and fine particles to asthma attacks, heart attacks, preterm birth, and other serious health harms, especially for children, older adults, and people with lung disease.
How to check the air
Residents can keep tabs on current conditions and forecasts at AirNow or on hyperlocal sensor maps like PurpleAir. On poor-air days, AirNow recommends that children, older adults, and people with heart or lung disease limit outdoor exertion. Households can cut exposure with HEPA filtration indoors, or N95 respirators when avoiding outdoor air is not an option.
What officials and advocates are saying
Advocates are urging elected officials and regulators to treat the report as a wake-up call, even as county programs try to chip away at emissions on the ground. The county has offered grants for local air-quality projects; a $5 million ACHD fund is backing electrification, tree plantings, and other local fixes, and watchdog groups such as GASP say enforcement and expanded monitoring remain priorities.
For now, Pittsburgh-area residents glued to AQI trackers will need to plan outdoor time around the forecasts and keep an eye on local advisories. The State of the Air report is a reminder that progress can be fragile, and that policy choices and on-the-ground enforcement will help decide whether the region’s air actually gets cleaner in the years ahead.
