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Question

According to National Ambient Air Quality Standards in India, the permissible 24 hour average concentration of lead in ambient air of an industrial area is :

A 1.0 mg/m³

B 2.0 mg/m³

C 3.03 mg/m³

D 4.0 mg/m³

Answer & Explanation
Answer:(A) is true, but (R) is false.

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