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According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for causing the greatest harm to human health?

1. 2.5 or less
2. 1.0 or less
3. 5.2–2.5
4. 10 or less

Correct answer: 2.5 or less

Solution

Particulate matter with a diameter of 2.5 micrometers or less (PM2.5) can penetrate deep into the lungs and even enter the bloodstream, causing significant health issues. This is why it is considered the most harmful to human health.

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