According to Central Pollution Control Board (CPCB), particulate size ________ micrometres or less in diameter are responsible for causing the greatest harm to human health.
2.5
Particulate matter is classified by aerodynamic diameter. CPCB and WHO identify PM2.5 — particles of 2.5 micrometres or less — as the most hazardous, because they bypass the upper airway defences and penetrate deep into the alveoli, even entering the bloodstream and triggering cardiovascular and respiratory disease.
PM10 causes upper-respiratory irritation but is less harmful than PM2.5. Hence the answer is 2.5.
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