Why the particulate matters bad for human health

PM2.5 means the find particulate matter under 2.5um. it can go inside body through breath.
Easy stay at human's lung and respiratory tract, so many people use air purifier now.
Particle counter which is the new machine to test the fine particulate matters quantity.
Also with the handheld particle counter can know the weight depends on world request.
Got all the details of bad air, then we can try to clean it away, let health back.


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