The 2025 “State of the Air” report highlights bright spots where clean air still prevails,with Honolulu and Casper,Wyoming tying for the best air in the nation. Other top performers include Cheyenne,Anchorage,St. George,Bozeman,Bangor,and parts of Maui—but the list of clean-air cities is shrinking as nearly half of Americans now live in areas that earned a failing grade.
