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After years of progress, the number of Americans breathing polluted air is rising, report says
By Jen Christensen
Phoenix ranked 7th for most ozone pollution in the nation, receives 'F' on new report
By Priscilla Totiyapungprasert
NYC Is Among Smoggiest Cities In Nation, Report Says
By Adam Nichols
Millions more Americans breathing dirty air as planet warms, study finds
By Emily Holden
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U.S. Cities With the Worst Air Pollution; The List is Out
By Jan Wesner Childs
Los Angeles named smoggiest city in America
By Elijah Chiland
Four in 10 Americans breathe unsafe air — and these 8 cities are the worst
By Nicole Lyn Pesce