Reductions in PM over decade has improved health; ozone pollution remains little changed

Read the full story from the American Thoracic Society.

Fewer deaths and serious illnesses have occurred in the US over the past decade as a result of cleaner air, according to a new report focusing on the two most potent air pollutants: fine particle (PM2.5) and ground-level ozone (O3). However, these improvements are almost entirely due to reductions in PM2.5 pollution.

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