WHO level of particulate matter PM 2.5

According to WHO standards, the level of Particulate Matter 2.5 should not exceed ___ per cubic meter. Fill the blanks with correct option?
[A]10 micrograms
[B]15 micrograms
[C]25 micrograms
[D]50 micrograms

10 micrograms
As per the World Health Organisation standards the level of particulate matter should not exceed 10 micrograms per cubic meter. As per the WHO report New Delhi exhibits 153 microorganisms of PM 2.5 per cubic meter.


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