Question:
The best method for routine monitoring of air pollution uses which set of indicators?
The best method for routine monitoring of air pollution uses which set of indicators?
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Match the option to the pollutants that make up the Air Quality Index.
Updated On: Jun 23, 2026
- Sulphur dioxide, smoke, and particulate matter
- Sulphur dioxide, hydrogen sulphide, carbon monoxide
- Carbon dioxide, hydrogen sulphide, lead
- Sulphur dioxide, lead, and particulate matter
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The Correct Option is D
Solution and Explanation
Step 1: The Air Quality Index (AQI) is the standard tool for routine air-pollution monitoring. It is built from a defined set of pollutants.
Step 2: These pollutants are particulate matter (PM2.5 and PM10), nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia, and lead.
Step 3: Comparing the options against this list, only option d, sulphur dioxide, lead, and particulate matter, contains a valid combination of AQI pollutants.
Why not the others: Hydrogen sulphide and carbon dioxide are not part of the routine AQI panel, so options b and c are out, and option a, while reasonable, is not the keyed best answer here.
Ref: PIB, Government of India (National Air Quality Index).
Step 2: These pollutants are particulate matter (PM2.5 and PM10), nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia, and lead.
Step 3: Comparing the options against this list, only option d, sulphur dioxide, lead, and particulate matter, contains a valid combination of AQI pollutants.
Why not the others: Hydrogen sulphide and carbon dioxide are not part of the routine AQI panel, so options b and c are out, and option a, while reasonable, is not the keyed best answer here.
Ref: PIB, Government of India (National Air Quality Index).
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