Question:medium
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?
Show Hint
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
Show Solution
The Correct Option is D
Solution and Explanation
Anchor on the Air Quality Index pollutant list and check each option against it. The AQI panel is: particulate matter (PM2.5 and PM10), nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia, and lead.
Run elimination. Option $c$ names carbon dioxide and hydrogen sulphide, neither of which is on the AQI list, so it goes. Option $b$ includes hydrogen sulphide too, so it also goes. Option $a$ uses smoke as a generic term rather than the keyed AQI components.
Option $d$, sulphur dioxide, lead, and particulate matter, is made up entirely of recognized AQI indicators, so it is the keyed best answer.
Ref: PIB, Government of India, National Air Quality Index.
Run elimination. Option $c$ names carbon dioxide and hydrogen sulphide, neither of which is on the AQI list, so it goes. Option $b$ includes hydrogen sulphide too, so it also goes. Option $a$ uses smoke as a generic term rather than the keyed AQI components.
Option $d$, sulphur dioxide, lead, and particulate matter, is made up entirely of recognized AQI indicators, so it is the keyed best answer.
Ref: PIB, Government of India, National Air Quality Index.
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