Air Pollution

New ‘gas standards’ in the works to fight pollution


Mains Paper 3: Environment | Conservation, environmental pollution and degradation, environmental impact assessment

From UPSC perspective, the following things are important:

Prelims level: CSIR, NPL, National Ambient Air Quality standards, Air Quality index

Mains level: Air pollution and measures being undertaken to reduce its effect


Government looking to prepare a unified testing methodology

  1. To ensure that all agencies that map air pollution use accurate instruments, the government is looking to prepare a unified testing methodology
  2. The Council of Scientific and Industrial Research (CSIR) -National Physical Laboratory (NPL) is in the process of setting up ‘gas standards’

What will be the standards?

  1. These will be reference samples of Carbon Monoxide (CO), Sulphur Dioxide (SO2), Nitrous Oxide (NO2) and Particulate –Pb (lead), –As (Arsenic) and –Ni (Nickel)

Present status

  1. Currently, the National Ambient Air Quality standards specify the upper limits for pollutants
  2. Based on this, the Air Quality Index — that grades air quality in cities from ‘Good’ to ‘Severe’ — is prepared for several Indian cities
  3. CPCB has prescribed guidelines for the maximum permissible levels of 12 gases and pollutants, depending on residential, rural or industrial locations

Way forward

  1. NPL would talk with environment-monitoring agencies like the the Central Pollution Control Board (CPCB) to see if these can become reference standards for use by all private and public agencies that measure pollution levels
  2. The NPL has also developed a custom air sampler that claims to measure PM2.5 levels far more accurately than existing devices

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