Many cities in the U.S. enjoy air that is considered clean for one or more of the pollution measures tracked in “State of the Air.” In this year’s report, 55 of the cities for which there is monitoring data had zero high short-term particle days and 75 cities had zero ozone days. Because year-round particle pollution is scored differently, the cleanest cities for this measure can be ranked, and the best 25 are considered cleanest.
In this year’s report, only five cities rank on all three cleanest cities lists for particle pollution and ozone. They had zero days high in particle pollution and in ozone and are among the 26 cities with the lowest year-round particle levels. After last year’s one-time appearance on all three cleanest lists, Asheville and Greenville, NC and Rochester NY all lost their place this year because of increases in ozone smog pollution. The other four again repeat their appearance on the combined list this year. Only Johnson City-Kingsport-Bristol, TN-VA, in its debut, was added to the list.
Listed alphabetically, the cleanest cities are:
- Bangor, ME
- Johnson City-Kingsport-Bristol, TN-VA
- Lincoln-Beatrice, NE
- Urban Honolulu, HI
- Wilmington, NC