Particulate matter and coal dust

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Airborne Particles

Airborne particles––also known as particulate matter (PM), particulates, or aerosols––refer to any mixture of solids and liquid droplets in the atmosphere. Particles can be directly emitted into the air or formed through chemical reactions of gaseous pollutants.

Particles are often distinguished by their size. The terms PM1, PM2.5, and PM10 are common ways particles are described, measured, and regulated, with the number in the subscript indicating the diameter particles in micrometers. Particles can also be described as very-fine (PM1), fine (PM2.5), and coarse (PM10) particles, with PM10 often called dust. Size affects how particles are regulated under the U.S. Clean Air Act and their health impacts.

Coal Dust

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