US air quality report finds a sharp uptick in pollution, with the hardest-hit cities in California - CNN

US air quality report finds a sharp uptick in pollution, with the hardest-hit cities in California  CNN137 million in US live with unhealthy levels of air pollution: American Lung Association  The HillLocal air quality, still lagging badly, improves in some respects  The Bakersfield CalifornianAmerican Lung Association: NYC's air quality is improving, but still gets a failing grade  Gothamist