PM2.5 is responsible for causing greatest harm to human health. What is it? How is it harmful?

Dear student,
The particulate matter with the diameter of 2.5μm which can be solid or liquid that are available in the atmosphere and cause pollution is PM2.5
PM2.5 causes respiratory disease like asthma and cardiovascular disease in the region in which PM2.5 is mostly suspended in air in that region. It also causes death from cardiovascular disease, lung cancer and respiratory disease.


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Yes . The PM2.5 stands for the particulate matter size 2.5 
It is so small that even air purifier cannot purify them
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