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: B. 90
- A. 10
- B. 90
- C. 800
- D. 750
Explanation
The older WHO permissible limit commonly quoted for particulate matter in air is 90 μg/m³. The much larger values are associated with heavily polluted or industrial conditions, not the recommended ambient limit.
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