Particle counter to avoid can not see each other in haze day

Particle counter is the machine to check fine particulate matters in the air.
PM2.5 is the main reason cause the haze day and also the smog.
We can not see each other when we leave even 10 meters. because of the haze and smog.
So we use the air particle counter to confirm the air quality around use.
To avoid this bad thing happen and which also effect our body and lung.


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reprinted:  http://www.ionaircleaner.com/health_and_environment/2314.html