Why PM2.5 danger for human body health also breath

Pm2.5 the PM is short for Particulate matter. 2.5 microns equivalent to the diameter of the hair silk 1/20.
Fine particles with a diameter of 2.5 microns are invisible to the naked eye.
Fine particles larger than PM2.5 are PM10, can not seen by eye too, but also harm to body.
Use the particle counter we can check both PM2.5 and PM10 in the air.


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