EE-Unit-II Ambient Air Quality Standards

National Ambient Air Quality Standards, as of 2009
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
  • Improved West and Gaeke
  • Ultraviolet fluorescence
24 hours** 80 80
NO2, μg/m3 Annual* 40 30
  • Modified Jacob & Hochheiser (Na-Arsenite)
  • Chemiluminescence
24 hours** 80 80
PM10, μg/m3 Annual* 60 60
  • Gravimetric
  • TOEM
  • Beta attenuation
24 hours** 100 100
PM2.5, μg/m3 Annual* 40 40
  • Gravimetric
  • TOEM
  • Beta attenuation
24 hours** 60 60
O3, μg/m3 8 hours** 100 100
  • UV photometric
  • Chemiluminescence
  • Chemical Method
1 hour** 180 180
Lead (Pb), μg/m3 Annual* 0.50 0.50
  • AAS/ICP method after sampling on EMP 2000 or equivalent filter paper
  • ED-XRF using Teflon filter
24 hours** 1 1
CO, mg/m3 8 hours** 2 2
  • Non Dispersive Infra Red (NDIR) spectrosopy
1 hour** 4 4
Ammonia (NH3) μg/m3 Annual* 100 100
  • Chemiluminescence
  • Indophenol blue method
24 hours** 400 400
Benzene Annual* 5 5
  • Gas chromatography based on continuous analyzer
  • Adsorption and Desorption followed by GC analysis
Benzopyrene (BaP) – particulate phase only, ng/m3 Annual* 1 1
  • Solvent extraction followed by HPLC/GC analysis
Arsenic (As), ng/m3 Annual* 6 6
  • AAS/ICP method after sampling on EMP 2000 or equivalent filter paper
Nickel (Ni), ng/m3 Annual* 20 20
  • AAS/ICP method after sampling on EMP 2000 or equivalent filter paper
* 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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