EE-Unit-II Ambient Air Quality Standards
Pollutant | Time Weighted Average | Concentration in Ambient Air | ||
---|---|---|---|---|
Industrial, Residential, Rural and Other Area | Ecologically Sensitive Area (notified by Central Government) | Methods of Measurement | ||
SO2, μg/m3 | Annual* | 50 | 20 |
|
24 hours** | 80 | 80 | ||
NO2, μg/m3 | Annual* | 40 | 30 |
|
24 hours** | 80 | 80 | ||
PM10, μg/m3 | Annual* | 60 | 60 |
|
24 hours** | 100 | 100 | ||
PM2.5, μg/m3 | Annual* | 40 | 40 |
|
24 hours** | 60 | 60 | ||
O3, μg/m3 | 8 hours** | 100 | 100 |
|
1 hour** | 180 | 180 | ||
Lead (Pb), μg/m3 | Annual* | 0.50 | 0.50 |
|
24 hours** | 1 | 1 | ||
CO, mg/m3 | 8 hours** | 2 | 2 |
|
1 hour** | 4 | 4 | ||
Ammonia (NH3) μg/m3 | Annual* | 100 | 100 |
|
24 hours** | 400 | 400 | ||
Benzene | Annual* | 5 | 5 |
|
Benzopyrene (BaP) – particulate phase only, ng/m3 | Annual* | 1 | 1 |
|
Arsenic (As), ng/m3 | Annual* | 6 | 6 |
|
Nickel (Ni), ng/m3 | Annual* | 20 | 20 |
|
* Annual arithmetic mean of minimum 104 measurements in a year at a particular site taken twice a week 24 hourly at uniform intervals.
** 24 hourly or 8 hourly or 1 hourly monitored values, as applicable, shall be compiled with 98% of the time in a year. 2% of the time, theymay exceed the limits but not on two consecutive days of monitoring.
|
3.2 Monitoring
The National Air Monitoring Programme (NAMP) is a nation-wide program headed by the Central Pollution Control Board whose purpose is to monitor levels of key air pollutants, report violations, and conduct research on pollution trends. NAMP monitors levels of SO2, NO2, Suspended Particulate Matter (SPM), and Respirable Suspended Particulate Matter (RSPM / PM10) at 342 operating stations in 127 cities across India.
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