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Number of days with poor air quality in U.S. metro areas 2018

This statistic displays the number of elevated smog pollution days that affected public health in U.S. metro areas in 2018. That year, the Riverside-San Bernardino-Ontario area in California experienced 227 days where half or more of the monitoring locations in the area reported elevated ozone and/or fine particulate matter.

Number of elevated air pollution days in the United States in 2018, by select metro area*

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Release date

January 2020


United States

Survey time period


Supplementary notes

* Number of days when half or more monitoring locations reported elevated ozone and/or particulate matter (PM2.5).

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Statistics on "Pollution in the U.S. "

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