Which of the following are criteria pollutants under national ambient air quality standards?
A. PM\(_2.5\)
B. NO\(_x\)
C. Lead
D. Methane
E. Sulphur dioxide
A. PM\(_2.5\)
B. NO\(_x\)
C. Lead
D. Methane
E. Sulphur dioxide
Show Hint
- A, B and D only
- A, B and C only
- A, C and E only
- A, B, C and E only
The Correct Option is D
Solution and Explanation
Step 1: Define "Criteria Pollutants".
Criteria air pollutants are a set of common air pollutants that are regulated by national environmental agencies because they can harm public health and the environment.
Step 2: List the criteria pollutants in India (under NAAQS).
India's National Ambient Air Quality Standards (NAAQS) regulate 12 pollutants: PM\(_10\), PM\(_2.5\) (A), Sulphur Dioxide (SO\(_2\)) (E), Nitrogen Dioxide (NO\(_2\)) (B, as part of NO\(_x\)), Ozone (O\(_3\)), Carbon Monoxide (CO), Lead (Pb) (C), Ammonia (NH\(_3\)), Benzene, Benzo(a)Pyrene, Arsenic, and Nickel.
Step 3: Evaluate the given options against the list. - A (PM\(_2.5\)), B (NO\(_x\)), C (Lead), and E (Sulphur dioxide) are all on the list. - D (Methane) is a major greenhouse gas but is not regulated as a criteria pollutant for direct ambient air quality in the same way. Conclusion: The correct combination from the options is A, B, C, and E.
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