Our Air Ranks in the Dirtiest 11.46% of U.S. Cities

Select a city from the dropdown on the right to compare our air.

Pittsburgh
CLEANEST (100%)
DIRTIEST (0%)

Percentile rank for average annual particle pollution out of 328 urban areas using U.S. EPA data from 2017-2019 (Clean Air Task Force, 2020).

MAJOR CITY
COMPARISON

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83.0% BOSTON
46.7% WASHINGTON D.C.
50.8% SEATTLE
51.7% NEW YORK CITY
42.1% BALTIMORE
24.6% CHARLOTTE
23.5% CLEVELAND
17.6% ST. LOUIS
26.0% PHILADELPHIA
14.2% ATLANTA
9.6% CINCINNATI
9.3% INDIANAPOLIS
11.46% PITTSBURGH
6.2% SAN FRANCISCO

BREATHE METER

Our air ranks in the dirtiest 11.46 percent of U.S. cities.

*Find out more about Pittsburgh’s Air Quality Trends

WHAT IS PARTICLE POLLUTION

Particle pollution, or soot, occurs year-round. It is a mixture of solid particles and liquid droplets. Fine particles are a subset of this group, the smallest of which measure 2.5 microns or less in diameter–1/30th the width of a human hair.

PM2.5 is especially dangerous because the microscopic particles can be inhaled deeply into the lungs and enter the bloodstream, causing serious health effects. Toxic gases can also “hitchhike” into the body on fine particles, bypassing the defenses of our nose and throat.

Some particle pollution is emitted directly; other particle pollution forms when precursors–such as sulfur dioxides, nitrogen oxides and ammonia–combine in the atmosphere. Sources include power plants, coke- and steel-making facilities, other industrial facilities, residential wood burning, motor vehicles and construction equipment.