Average exposure to PM2.5 in the United States 2020-2023, by state

Published by Ian Tiseo, Feb 20, 2025

The state of California had the worst air quality in the United States from 2020 to 2023, with average fine particulate matter (PM2.5) concentrations of 12.7 micrograms per cubic meter (µg/m³). This was roughly three times higher than the average PM2.5 concentration in Hawaii, the U.S. state with the cleanest air. Some of the factors affecting air pollution in California include vehicle emissions, industrial processes, and wildfires.

Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter)

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Release date

December 2024

Region

United States

Survey time period

2020 to 2023

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Air pollution in the U.S.Greenhouse gas emissions in the U.S.Environmental pollution worldwideEnvironmental pollution in the U.S.Cleantech in the U.S.
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