Environmentalmedium · Past Paper
In the context of air quality, what does 'PM2.5' refer to?
AParticulate matter with diameter less than 2.5 micrometers
BPressure measured at 2.5 atmospheres
CPollution level in 2.5 square kilometers
DPercentage of methane being 2.5%
✓ Correct Answer: A — Particulate matter with diameter less than 2.5 micrometers
PM2.5 particles are small enough to enter deep into the lungs and even the bloodstream, posing significant health risks.
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