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Air Pollution
AMBIENT AIR QUALITY STANDARDS (NATIONAL)
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Pollutants |
Time-weighted average |
Concentration in ambient air |
Method of measurement |
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Industrial Areas |
Residential, Rural & other Areas |
Sensitive Areas |
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| SulphurDioxide (SO2) |
Annual Average* |
80 µg/m3 |
60 µg/m3 |
15 µg/m3 |
- Improved West and Geake Method - Ultraviolet Fluorescence |
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24 hours** |
120 µg/m3 |
80 µg/m3 |
30 µg/m3 |
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| Oxides of Nitrogen as (NO2) |
Annual Average* |
80 µg/m3 |
60 µg/m3 |
15 µg/m3 |
- Jacob & Hochheiser Modified (Na-Arsenite) Method |
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24 hours** |
120 µg/m3 |
80 µg/m3 |
30 µg/m3 |
- Gas Phase Chemiluminescence | |
| Suspended Particulate Matter (SPM) |
Annual Average* |
360 µg/m3 |
140 µg/m3 |
70 µg/m3 |
- High Volume Sampling, (Average flow rate not less than 1.1 m3/minute). |
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24 hours** |
500 µg/m3 |
200 µg/m3 |
100 µg/m3 |
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| RespirableParticulate Matter (RPM) (size less than 10 microns) |
Annual Average* |
120 µg/m3 |
60 µg/m3 |
50 µg/m3 |
- Respirable particulate matter sampler |
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24 hours** |
150 µg/m3 |
100 µg/m3 |
75 µg/m3 |
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| Lead (Pb) |
Annual Average* |
1.0 µg/m3 |
0.75 µg/m3 |
0.50 µg/m3 |
- ASS Method after sampling using EPM 2000 or equivalent Filter paper |
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24 hours** |
1.5 µg/m3 |
1.00 µg/m3 |
0.75 µg/m3 |
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| Ammonia1 |
Annual Average* |
0.1 mg/ m3 |
0.1 mg/ m3 |
0.1 mg/m3 |
. |
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24 hours** |
0.4 mg/ m3 |
0.4 mg/m3 |
0.4 mg/m3 |
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| CarbonMonoxide (CO) |
8 hours** |
5.0 mg/m3 |
2.0 mg/m3 |
1.0 mg/ m3 |
- Non Dispersive Infra Red (NDIR) |
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1 hour |
10.0 mg/m3 |
4.0 mg/m3 |
2.0 mg/m3 |
Spectroscopy | |
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* |
Annual Arithmetic mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform interval. |
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** |
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. |
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NOTE:
- National Ambient Air Quality Standard: The levels of air quality with an adequate margin of safety, to protect the public health,, vegetation and property.
- 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 investigations.
- The standards for H2S and CS2 have been notified seperately vide GSR No. 7, dated December 22, 1998 under Rayon Industry - for details please see Sl. No. 65 of this document.
[S.O. 384(E), Air (Prevention & Control of Pollution) Act, 1981, dated April 11, 1994 ]
[EPA Notification: GSR 176 (E), April 02, 1996]
1. Included vide Notification SO. 955 (E), Air (Prevention & Control of Pollution) Act, 1981 dated October 14,
1998)
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