Paper 1 · People, Development and Environment
UGC NET December 2021 June 2022 (08.10.2022) Shift-II
Indian National Ambient Air Quality Standards stipulate the maximum permissible limit of the annual mean concentration of PM2.5 to be
A60 micrograms per cubic metre
B45 micrograms per cubic metre
C40 micrograms per cubic metre ✓ Correct
D25 micrograms per cubic metre
Correct answer: (C) 40 micrograms per cubic metre — The answer is 40 micrograms per cubic metre.
Explanation
★The answer is 40 micrograms per cubic metre.
★The National Ambient Air Quality Standards set limits for key pollutants.
★For PM2.5 the annual mean limit is 40 micrograms per cubic metre.
★The 24-hour limit for PM2.5 is a higher 60 micrograms per cubic metre.
★So the annual mean limit asked here is 40 micrograms per cubic metre.
★The other options do not match the annual mean standard.
★So the answer is 40 micrograms per cubic metre.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Shared by Mcqkart · via Mcqkart.in