Q In the context pf PM2.5, what does 2.5 mean

A. Particulate matter of size 2.5 μm.
B. Particulate matter of average size 2.5 μm
C. Particulate matter of size 2.5 μm and less
D. None of these

Correct Answer: C

Explanation:

The term fine particles, or particulate matter 2.5 (PM2.5), refers to tiny particles or droplets in the air that are two and one half microns or less in width.

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