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Ambient Air Quality Standards
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Ambient Air Quality Standards

Ambient air quality standards are the legal limits of air pollutants during given period of time defined by authority. They are allowable level of pollutants in environment to the population or ecological system.

National Ambient air quality standards (NAAQS) for ambient air quality monitoring (NAAQM) established by Central pollution Control Board (CPCB) of India in November 2009 for the ambient air quality of entire country. Addition to this CPCB has notified the quality of air in its notification.

Categories for Ambient Air Quality Standards

For this Purpose Entire country was divided into three categories

  • Industrial Areas
  • Residential and Rural Area
  • Sensitive Area (Schools, Hospitals etc.)Ambient Air Quality Standards

Main objective of to define Ambient air quality standards is to protect Human health. For normal populations as well as children, elder adult, Individuals suffering from respiratory diseases like asthma etc. Also to provide uniform quality for all, irrespective of land use purpose, across all country.

Standards for Major Four Parameters like SPM, SO2, CO and NOx only are defined. Ambient air quality standards become strict as we go from category 1 to 3.

There are total 12 parameters identified by CPCB affect human health, which are to be measured across all country by same method to keep uniformity.

Ambient Air Quality Standards

Below are the National ambient Air Quality Standards Chart dated 16.11.2009

POLLUTANTS Time Weighted Avg Concentration of Ambient Air
Industrial Area Residential Rural and other area Sensitive area Method of Measurement
Sulphur Dioxide (SO2) Annual Average 80 gm/m3 60 gm/m3 15 gm/m3 Improved west and Gacke Method
24 hrs 120 gm/m3 80 gm/m3 30 gm/m3 Ultraviolet fluorescence
Oxides of Nitrogen (NO2) Annual Average 80 gm/m3 60 gm/m3 15 gm/m3 Jacab Hochheister modified (Na-Arsentire method
24 hrs 120 gm/m3 80 gm/m3 30 gm/m3 Gas Phase Chemilumine Scene
Suspended Particulate Matter (SPM) Annual Average 360 gm/m3 140 gm/m3 70 gm/m3 High Volume sampling (average flow rate not less than 1.1 m3/minute)
24 hrs 500 gm/m3 200 gm/m3 100 gm/m3
Respirable Particulate Matter (size < 10 m) RPM Annual Average 120 gm/m3 60 gm/m3 50 gm/m3 Respirable particulate matter sampler
24 hrs 150 gm/m3 100 gm/m3 75 gm/m3
Lead as Pb Annual Average 1.0 gm/m3 0.75 gm/m3 0.50 gm/m3 AAS method after sampling using EPM 2000 or equivalent filter paper
24 hrs 1.5 gm/m3 1.0 gm/m3 0.75 gm/m3
Carbon Monoxide 8 hrs 5.0mgm/m3 2.0mgm/m3 1.0mgm/m3 Non disbersive infrared spectroscopy
1 hour 10.0mgm/m3 4.0mgm/m3 2.0mgm/m3

National Ambient Air Quality Standards Chart (NAAQS) (Image)

National Ambient Air Quality Standards Chart (NAAQS) - Perfect Pollucon Services
National Ambient Air Quality Standards Chart (NAAQS) – Perfect Pollucon Services

Annual Average means arithmetic mean for at least 104 readings in a year twice a week 24 hourly at uniform level

24 Hrs Average means 24 hourly, 8 hourly or 1 hourly ambient air quality monitoring values, as applicable, shall be complied with 98% of time. For remaining 2% days it can exceed but not on two consecutive days.

If ambient air quality monitoring results on two consecutive days of monitoring exceeds limits specified above for mentioned category, then that company should carry out regular/non-stop monitoring till further notice. Government Publish these results via newspapers TV or radio in regular intervals for major cities. For layman’s understanding there are some changes while showing it to them. They convert it into Air Quality index.  it is just a ratio of actual pollutants levels present to permitted limits by pollution control board.

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Ambient Air Quality is Part of Environmental Monitoring.

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Air Quality Index

1 thought on Ambient Air Quality Standards

  1. Rashi Shetty says:
    at

    Thanks for sharing this article. Here is some information about UV Water Analyzer offers an affordable and accurate solution for real-time UV or UVT monitoring.

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Ambient Air Quality Standards