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.

The article is provide from [Lanjia Water Ionizer], please indicate the source address
reprinted: http://www.ionaircleaner.com/health_and_environment/2314.html
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