Environmental Engineering MCQ: As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _________ μg/m3.(μg-microgram)

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As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _________ μg/m3.(μg-microgram)

Correct Answer: 90

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