Why there are to much bad air around us

PM2.5 become a big questions to human's usual life.
Some family use Air purifier to clean the bad air but do you know if it cleaned or not?
The big reason cause the bad air quality is Industrial sources, Motor vehicle exhaust and dust.
We need a handheld particle counter test the air quality before clean.
Also can use PM2.5 detector after clean to compair the change or bad air.


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reprinted: http://homehealthywater.com/health-care-knowledge/1587.html