A lot of children easy to cough is because of the indoor air contains too much PM2.5.
Particle counter is the best machine to check air quality around us.
It is show with the PM2.5 and PM10 result also the temperature and humidity.
The latest version laser particle counter with the purification rate function.

This article is provide from [Lanjia Water Ionizer], please indicate the source address reprinted: http://www.ionaircleaner.com/health_and_environment/2425.html
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