engineering recuitment GATE CE 2023-24 Test Series Environmental Engineering Air and Noise Pollution
According to pre-revised National ambient air quality standards (NAAQS) for Indian industrial Areas, the permissible concentrations in ambient air for sulphur dioxide (pollutant) will be _______.
1
200 μg/m3
2
140 μg/m3
3
120 μg/m3
4
80 μg/m3