The Air Quality Index (AQI) threshold above which outdoor physical activity should be avoided for sensitive groups (children, elderly, those with respiratory disease) is:
- A AQI > 150
- B AQI > 100 ✓
- C AQI > 200
- D AQI > 300
Correct answer: B. AQI > 100
Explanation
India's National AQI categories: 0–50 (Good), 51–100 (Satisfactory), 101–200 (Moderate), 201–300 (Poor), 301–400 (Very Poor), 401–500 (Severe). At AQI >100 (entering 'Moderate' and above), sensitive groups including children, the elderly, and individuals with asthma or heart disease are advised to limit prolonged outdoor exertion. The general public is advised to reduce outdoor activity at AQI >200 (Poor category).
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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