size of a particular matter in air is measured in chromatin micrometre millimetre
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The resulting air pollution is characterized by raised sulfur dioxide and nitrogen oxide levels and very high concentrations of airborne particles and particulate matter (PM). Annual seasonal average particulate matter concentrations have been recorded as high as 279 μg/m3 (micrograms per cubic meter).
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Particles are commonly classified according to their size as either coarse or fine. Fine particles have a diameter of 2.5 μm (PM2.5) or less, and coarse particles are 10 μm or less (PM10). Particulate matter that has a diameter over 100 μm tends not to stay airborne long enough to be measured.
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