National Ambient Air Quality Standards
Pollutants Time weighted average Concentration in ambient air Industrial Area Residential, Rural & other Areas Sensitive Area 1 2 3 4 5 Sulphur Dioxide(SO2) Annual Average* 80 µg/m3 60 µg/m3 15 µg/m3 24 hours** ** 120 µg/m3 80 µg/m3 30 µg/m3 Oxides of Nitrogen as NO2 Annual Average* 80 µg/m3 60 µg/m3 15 µg/m3 24 hours** ** 120 µg/m3 80 µg/m3 30 µg/m3 Suspended Particulate Matter (SPM) Annual Average* 360 µg/m3 140 µg/m3 70 µg/m3 24 hours** ** 500 µg/m3 200 µg/m3 100 µg/m3 Respirable Particulate Matter (RPM) (size less than 10 microns)