More than one-third of Americans live in places with unhealthy levels of air pollution, according to an annual report published by the American Lung Association. The 24th iteration of the State of the Air report determined 19 million fewer Americans live in these areas.
Unhealthy levels of pollution were defined as receiving a failing grade for one of the three metrics.
The annual report looked at three air quality measures: Particle pollution, broken into daily averages and daily spikes, and ozone levels, which are tracked by the Environmental Protection Agency (EPA).
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