3 out of every 8 Americans live in counties with F grades for ozone smog.
The list of 25 cities with the worst ozone pollution in “State of the Air” 2022 and their order of ranking remained relatively stable compared with last year’s report. Cities that improved enough to move off the list were Milwaukee and Sheboygan, Wisconsin; Philadelphia; and the Washington-Baltimore metro area. They were replaced by San Luis Obispo, Reno, Detroit and San Antonio.
Cities in the West and the Southwest continue to dominate the most ozone-polluted list. California retains its historic distinction of having the most cities on the list, with 11 of the 25 most-polluted cities. The Southwest fills most of the remaining slots, with an equal number. In this year’s report, only three of the worst 25 cities for ozone are east of the Mississippi River. And no metropolitan areas in the Pacific Northwest, the Mid-Atlantic or the Southeast rank among the 25 worst cities most polluted by ozone.
The three years covered by State of the Air 2022 ranked among the seven hottest years on record globally.
NOAA National Centers for Environmental Information, Global Climate Report--Annual 2017, published online January 2018. Accessed at https://www.ncdc.noaa.gov/sotc/global/201713