Environment & Ecology · Environmental Pollution
Which one of the following statements correctly defines PM1 particles in air?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1These are large coarse particles that settle immediately on the soil surface without traveling in air currents.
- 2These are extremely fine suspended particles with an aerodynamic diameter of less than 1 micron.✓
- 3These are coarse dust particles that are entirely filtered out by the human nose during normal respiration.
- 4These are suspended particulate matter with an aerodynamic diameter of more than 10 microns.
Correct answer
These are extremely fine suspended particles with an aerodynamic diameter of less than 1 micron.
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