Particulate Matter (PM) also known as particulate pollution is a combination of liquid droplets and solid particles. It is classified as problematic if it is PM10 which is 10 micrometres and smaller and PM2.5 (known as fine particulate) which is 2.5 micrometres and smaller. That’s about 3% of the diameter of a human hair. Both can be inhaled and cause problems. Particulate dust and smoke can be seen by the naked eye, but the smaller particulars can only be seen with an electronic microscope so easily go unnoticed.
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