What is the function of PM2.5 detector

Compared with coarser of atmospheric particulates, PM2.5 is small, rich in a lot of poisonous and harmful substances, and in the atmosphere for a long time, transmission distance, and to human health and the impact of atmospheric environment quality.
So we need to use PM2.5 detector to test the air quality around us if it is good for health or not.
Then can use air purifier to clean the air. to test again with PM2.5 detecor to know the different before clean and after clean.


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