Estimated days with unhealthy air quality, 2024
Days in 2024 predicted to have an average air quality index of 100 or higher under current climate conditions
Map of U.S. counties showing the estimated number of days that will have unhealthy air quality in 2024, from a February 2024 report. The majority of counties on the West Coast are expected to see 10 or more days with unhealthy air quality in 2024, with Siskiyou County, Calif., expected to see the most at 68. Counties in the Midwest and Northeast are expected to see little to no days with unhealthy air quality this year.
