PM 2.5 : fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller.PM 10 : inhalable particles, with diameters that are generally 10 micrometers and smaller and. ![]() Others are so small they can only be detected using an electron microscope. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. ![]() PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air.
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