Taking Measure Of Particulate Matter

In the December 5 Issue:

TABLE OF CONTENTS
Climate might be right for a deal: Copenhagen negotiations will take steps toward a climate-stabilizing treaty
Botanical Whales: Adventures in the Tortugas reveal that seagrass fields need saving too
Breaking the Speed Limit: Studies examine physiology and technology to better foresee the ultimate edge of human performance

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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