According to a report from the American Lung Association (ALA), approximately 156 million Americans, or 46 percent of the population, lived in areas with unhealthy air quality from 2021 to 2023, the period of analysis in the most recent report. This represents a higher number of individuals than at any time in the preceding decade. Bakersfield-Delano, California, was the region most affected by pollution.
The report suggests that the United States is experiencing a decline in clean air measures. Record-breaking heat, drought and wildfire smoke caused by climate change are damaging air quality throughout the country. The ALA’s analysis is based on official air quality monitoring sites maintained by federal, state and tribal governments.
An unrelated 2023 report from Stanford University, published in the journal Nature, estimated that wildfire smoke has undone about a quarter of the progress achieved under the Clean Air Act of 1963.
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