Environment & Ecology · Environmental Pollution
In the context of air pollution metrics like PM2.5, what does '2.5' signify?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Particulate matter of size 2.5 nm and less
- 2Particulate matter of size 2.5 μm and less✓
- 3Particulate matter of average size 2.5 μm
- 4Particulate matter of exactly 2.5 μm size
Correct answer
Particulate matter of size 2.5 μm and less
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