engineering recuitment APSC AE Civil 2020 Test Series Environmental Engineering Air and Noise Pollution
The permissible standards measured annually of air quality fixed in India for residential areas for PM10, PM2.5, SO2, and NO2 in μg/m3 respectively are
1
50, 60, 80 and 100
2
60, 40, 50 and 40
3
100, 80, 60 and 40
4
40, 50, 60 and 80