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Three-quarters of a century ago, the Pittsburgh area’s air quality was such that the city was derisively referred to as “Hell with the Lid Off.” For decades afterward, steel mills were rampant and so was pollution. Most of those mills disappeared by the late 1980s and the region’s skies have improved since. They may not be pristine, but according to findings from a recent analysis, they are much better. Pittsburgh Works Together, a nonpartisan alliance of labor, industry and civic leaders, released its findings on Thursday in a report titled “Clearing the Air.” The year-old group examined data, including small particulate matter and ozone, and concluded that air quality has improved across the Pittsburgh region over the past decade and “is typical for a big-city metropolitan area.”

United statesSteel cityAllegheny countyMorgan obrienBruce mansfieldRob altenburgMatt mehalikJeff nobersPa university of pittsburghAllergy foundation of americaDepartment of environmental protectionEnergy centerLid offWorks togetherPittsburgh worksAllergy foundation