Air quality in the Pittsburgh metropolitan area continues to rank among the worst in the nation, despite steady improvements in soot and smog levels.Allegheny County received an an "F" for both particle and ozone pollution.
Other regions throughout the nation are improving air quality at a faster pace.
In the American Lung Association's "State of the Air 2011" report released Tuesday, the Pittsburgh area ranked as the nation's third most polluted area for short-term particle pollution for the second year in a row. It ranked behind only the Bakersfield-Delano and Fresno-Madera areas of California.
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