Change in air quality by metro area, 2015 to 2021
Micrograms per cubic meter of fine particle pollution; Three-year rolling annual average in select metro areas
Map of the U.S. showing the change in air quality by metro area from 2015 to 2021, as measured by the concentration of fine particle pollution. Cities in the northeast and midwest saw their air quality improve across the time period, while cities in Florida, northern California and Oregon saw their air quality worsen.
