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Jesse Ethier Dr. Warner AP Environmental 13 November 2007 Suspended Particulate Matter: a Primary Air Pollutant Suspended particulate matter, alternatively referred to as particulates, aerosols, or fine particles, are tiny particles of solid or liquid suspended in gas. Particulate matter, or PM, is the term for particles found in the air, including dust, dirt, soot, smoke, and liquid droplets. Particles can be suspended in the air for long periods of time. Some particles are large or dark enough to be seen as soot or smoke. Others are so small that individually they can only be detected with an electron microscope. Particles less than 10 micrometers in diameter (PM10) pose a health concern because they can be inhaled into and accumulate in the respiratory system. Particles less than 2.5 micrometers in diameter (PM2.5) are referred to as fine particles and are believed to pose the greatest health risks. Because of their small size (approximately 1/30th the...

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