Fine particle air pollution is a public health emergency hiding in plain sight

The average human hair is about 70 micrometers in diameter — 30 times larger than the largest fine particle. EPA

Where there’s smoke …

Coverage of an air quality alert in Delhi and neighboring cities, Nov. 5, 2018.

Regulatory push and pull

U.S. counties failing to meet national standards for at least one of six major air pollutants regulated under the Clean Air Act: PM2.5, PM10, sulfur dioxide, carbon monoxide, nitrogen dioxide and eight-hour ozone. EPA

No time for complacency

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