Pittsburgh ranks in the bottom 10% for air quality among all other US cities. Here are a few articles that discuss our air quality.
Study estimates Pittsburgh ranks 4th in air pollution-related deaths nationally
https://www.pghcitypaper.com/pittsburgh/study-estimates-pittsburgh-ranks-4th-in-air-pollution-related-deaths-nationally/Content?oid=15182486
Pittsburgh gets and F in air quality
https://www.post-gazette.com/local/2019/04/24/Pittsburgh-regional-air-quality-gets-failing-grades-again/stories/201904230099