| 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) | Annual Average* | 120 µg/m3 | 60 µg/m3 | 50 µg/m3 | | 24 hours**** | 150 µg/m3 | 100 µg/m3 | 75 µg/m3 | Lead | Annual Average* | 1.0 µg/m3 | 0.75 µg/m3 | 0.50 µg/m3 | | 24 hours**** | 1.5 µg/m3 | 1.0 µg/m3 | 0.75 µg/m3 | | Ammonia1 | Annual Average* | 0.1 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 | | | 24 hours**** | 0.4 mg/m3 | 0.4 mg/m3 | 0.4mg/m3 | Carbon Monoxides | 8 hours** | 5.0 mg/m3 | 2.0 mg/m3 | 1.0 mg/m3 | | 1 hours | 10.0 mg/m3 | 4.0 mg/m3 | 2.0 mg/m3 | | * | Annual Arithmetic mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform interval. | | ** | 24 hourly/ 8 hourly values should be met 98% of the time in a year. However, 2% of the time, it may exceed but not on two consecutive days.Annual Arithmetic mean of minimum 104 measurements in a year taken twice a week at uniform interval. | NOTE:
1. National Ambient Air Quality Standard: The levels of air quality with an adequate margin of safety, to protect the public health, vegetation and property.
2. Whenever and wherever two consecutive values exceeds the limit specified above for the respective category, it would be considered adequate reason to institute regular/ continuous monitoring and further investigation. S.O. 384(E), Air (Prevention & Control of Pollution) Act, 1981, dated April 11, 1994] [EPA Notification: GSR 176(E), April 02, 1996].
1. Include vide Notification SO.955(E), Air (Prevention & Control of Pollution) Act, 1981, dated October 14, 1998] |
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