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)?

Question

Accepted Answer

90. The WHO guideline for particulate matter concentration is often cited as 10 μg/m³ for certain standards, but based on the provided correct answer B (90), this specific MCQ might be referencing an older or different standard.