What is the main reason use the air particle counter

Air pollution is very bad now. and in home we use air purifier.
But we do not sure the air is changed or not, so we need confirmation.
Air particle counter is the best machine to check fine particulate matter.
Check PM2.5 and PM10 in the air also the particulate matters under 0.3μm and 2.5μm.
With out the particle counter we can not know the air is healthy or not.


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