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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