GATE 2022 AR — Planning – Question 44

Environmental Planning and Landscape · Environmental pollution- types, causes, controls and abatement strategies · 2 marks · Multiple select

According to CPCB’s National AQI framework 2014, which statements are correct?

AQI uses an 8-hour CO value.
AQI uses a 2-hour PM 2.5 value.
AQI considers ozone concentration.
AQI considers carbon-dioxide concentration.

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Show answer and explanation

Correct answer: (A) AQI uses an 8-hour CO value.; (C) AQI considers ozone concentration.

Explanation

CO is evaluated using the 8-hour averaging period (A), and ozone is one of the index pollutants (C). PM 2.5 uses a 24-hour basis rather than 2 hours. Carbon dioxide is not one of the eight AQI pollutants in this framework. Select A, C.

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