I live in Pittsburgh and travel extensively for work. Absolutely no sensible comparison can be made on any level between Pittsburgh and the other cities on this list. Sure a comparison could be made 50 years ago, but not today. According to the EPA Air Quality / Hazardous Air Pollutants, Pittsburgh (Allegheny County) ranks better than 50 other counties including, Los Angeles, Phoenix (Maricopa County), Chicago (Cook County) and Cleveland (Cuyahoga County). Seems the popsci staff got lazy on this one.
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