The report found that the census tracts with the highest risk - TopicsExpress

The report found that the census tracts with the highest risk levels are clustered in the southeastern corner of Allegheny County where heavy industries and coking operations affect air quality in the Liberty-Clairton area and in neighborhoods downwind from Neville Island, and in Downtown Pittsburgh, where diesel emissions play a major role. post-gazette/news/environment/2013/11/21/Report-Allegheny-County-in-top-2-percent-in-U-S-for-cancer-risk-from-air-pollution/stories/201311210326