Environmentalmedium · Past Paper
Particulate matter PM 2.5 refers to particles with a diameter less than:
A2.5 centimeters
B2.5 millimeters
C2.5 micrometers
D2.5 nanometers
✓ Correct Answer: C — 2.5 micrometers
PM 2.5 particles are tiny enough to enter the lungs and even the bloodstream, posing serious health risks.
Share this question
More from Environmental
- Which process uses microorganisms to clean up polluted soil or water?
- In Nepal, the 'Buffer Zone' program was first introduced in which National Park?
- Which gas is produced by the reaction of sunlight with nitrogen oxides and volatile organic compounds (VOCs) at ground level?
- 'Leachate' is a term associated with:
- The 'Montreal Protocol' is an international treaty designed to protect the: