What is PM ?

PM refers to the particulate matter in the atmosphere, which is a relatively complex multi-dispersed mixture.

Definition of PM2.5:

Refers to the airborne particles whose aerodynamic equivalent diameter is less than 2.5 microns, also known as fine particles.

Form: Smoke,dust,fog

Size distribution:total suspended particulates TSP(dp<100 μm),floating dust(dp<30μm),PM10, PM2.5……

Source: mainly industrial production, motor vehicle exhaust, road and construction dust,ect.


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