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according-to-cpcb-standards-the-annual-average-concentration-of-pm-2-5-should-not-exceed

According to CPCB standards, the annual average concentration of PM2.5 should not exceed :

A 60 mg m²³

B 40 mg m²³

C 80 mg m²³

D 100 mg m²³

Answer & Explanation
Answer:40 mg m²³

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