Taking Measure Of Particulate Matter

In the February 25 Issue:

Taking measure of particulate matter

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Pollutant particles tiny enough to be inhaled deeply into the lungs, typically PM-2.5 and smaller, can’t be seen with the naked eye but collectively can contribute to hazy skies. The particles can grow in size as they collide and stick to others or become jacketed with other airborne chemicals. Smaller particles can ride air currents for days to weeks, traveling far — until washed out by rains. Credit: Courtesy of EPA Office of Research and Development; modified by A. Nandy

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