Environment & Ecology · Environment
What does the term 'PM2.5' signify in the context of environmental air pollution monitoring?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Particulate matter with an aerodynamic diameter smaller than 2.5 micrometres✓
- 2Concentration of heavy water droplets floating in ambient air
- 3Microplastic polymers measuring exactly 2.5 mm
- 4Sound pressure waves travelling at 2.5 kHz
Correct answer
Particulate matter with an aerodynamic diameter smaller than 2.5 micrometres
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