HomeU.S. EPA tightens soot standards for first time in decadeFILE PHOTO: The Rocky Mountains are pictured as a layer

FILE PHOTO: The Rocky Mountains are pictured as a layer

FILE PHOTO: The Rocky Mountains are pictured as a layer of air pollution hangs over Denver, Colorado, U.S. January 21, 2020. Picture taken January 21, 2020. REUTERS/Jim Urquhart/File Photo
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