Paticulate matters (PM) must be the most complicated pollutant in the air. Acording to aero dynamic equivalent diameter, PM are divided into TSP(total suspend particulate),PM10(aero dynamic equivalent diameter <=10um), PM 2.5(aero dynamic equivalent diameter <=2.5um) and others. There are many components in PM including heavy metals, dioxins, POPs, VOCs and other toxic substances. The more PM in ambient air, the darker air appears. So pay attention to thi type pollutant .
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