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.
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