Paper 1 · People, Development and Environment
UGC NET June 2023 (13.06.2023) Shift-II
Air Quality Index (AQI) is represented in
AUnit of microgram per metre cube
BUnit of ppm
CPercentage
DNumber ✓ Correct
Correct answer: (D) Number — The AQI is represented as a number, so the answer is number.
Explanation
★The AQI is represented as a number, so the answer is number.
★The Air Quality Index reports daily air quality on a single numerical scale.
★The Indian AQI runs from 0 to 500, with higher numbers meaning worse air.
★The bands are good, satisfactory, moderate, poor, very poor and severe, each with a colour code.
★Microgram per cubic metre is the unit of individual pollutant concentration, not the index itself.
★Parts per million measures gas concentration, and percentage is not used for the index.
★The AQI converts several pollutant concentrations into one number so the public can read it easily.
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