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What is the pollution source of PM2.5?
The main source of PM2.5 is the residue discharged from combustion during daily power generation, industrial production and automobile exhaust emission, most of which contain toxic substances such as heavy metals.

Generally speaking, fine particulate matter (PM2.5) below 2.5 microns mainly comes from the combustion of fossil fuels (such as automobile exhaust and coal burning) and volatile organic compounds.