PM 2.5
PM 2.5 is a very small atmospheric particle of diameter less than 2 micrometer, which is about 3% of diameter of human hair.
Why it is dangerous?
Due to their very small size, PM 2.5 easily bypass the nose and throats and enter the circulatory system.
Diseases cause by PM 2.5 are Asthma, Heart attack, Bronchitis and other respiratory problems.
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