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Where air pollution is improving - and where it's worsening

Air quality, as measured by fine particle pollution, improved across much of the country between 2015 and 2021, though it worsened across several Western states and Florida.

WSU study finds air pollution, brought on by heat and wildfires, is increasing in the West

WSU study finds air pollution, brought on by heat and wildfires, is increasing in the West

The presence of harmful particles called particulate matter, or PM 2.5, and ozone can make air unhealthy to breathe, and a WSU researcher discovered that the frequency, intensity and unhealthy level of pollution from both particles has increased dramatically, especially in the past decade.

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