Arizona’s Phoenix-Mesa-Scottsdale metro area has the worst air quality in the country. In 2021, the area experienced unhealthy air quality on 64.9% of days, while only having good air quality 3% of the time.
In contrast, three US metros: Urban Honolulu and Kahului, both in Hawaii, and Lake Havasu City/Kingman, Arizona, had healthy air quality on more than 99% of days in 2021.
