PM classification is based on the aerodynamic diameter of airborne particulate matter. PM1
Which one of the following statements correctly defines PM1 particles in air ?
Asked in UPSC CAPF 2024 · Topic: Pollution (Air Pollution: Types, sources, primary & secondary pollutants, smog, acid rain, effects, control technologies & policies.)
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Answer: C. These are extreme fine particles of diameter less than 1 micron
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