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Ambient Air Quality Standards

प्रिंट

Pollutants Time-weighted average Concentration in ambient air Method of measurement
Industrial Areas Residential, Rural & other Areas Sensitive Areas
SulphurDioxide
(SO2)		 Annual Average* 80 µg/m3 60 µg/m3 15 µg/m3 - Improved West and Geake
Method
- Ultraviolet Fluorescence
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 - Jacob & Hochheiser Modified
(Na-Arsenite) Method
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, (Averageflow rate not less than 1.1m3/minute).
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 - Respirable particulate matter
sampler
24 hours** 150 µg/m3 100 µg/m3 75 µg/m3  
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
24 hours** 1.5 µg/m3 1.00 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 0.4 mg/m3
CarbonMonoxide (CO) 8 hours** 5.0 mg/m3 2.0 mg/m3 1.0 mg/ m3 - Non Dispersive Infra Red (NDIR)
1 hour 10.0 mg/m3 4.0 mg/m3 2.0 mg/m3 Spectroscopy

*		 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 thetime, it may exceed but not on two consecutive days.