Nearly Everyone is Exposed to Unhealthy Levels of Tiny Air Pollutants, Study Says
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Kasha Patel
The Washington Post
Communities: Allegheny County Ohio River Communities, Ambridge, Beaver, Braddock, Cheswick, Clairton, East End - Squirrel Hill - Pittsburgh, Elizabeth Township, Franklin Park, Hazelwood, Lawrenceville, North Side, Penn-Trafford, Sewickley and Sewickley Valley, Uptown - Hill District, Washington
