In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index? 1. Carbon dioxide 2. Carbon monoxide 3. Nitrogen dioxide 4. Sulfur dioxide 5. Methane Select the correct answer using the code given below.
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A hard Environment multiple-choice question from UPSC Prelims 2016. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: B. 2, 3 and 4 only
The Air Quality Index considers carbon monoxide (2), nitrogen dioxide (3) and sulphur dioxide (4), among other pollutants (PM10, PM2.5, ozone, ammonia, lead). Carbon dioxide and methane are not part of the AQI. So 2, 3 and 4 only — option (b).
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