Related Topics

Stubble Burning
2023 NOV   24
Biomass Co-firing
2023 OCT   25
2023 AUG   23

Graded Response Action Plan

2023 NOV 5

Preliminary   > Environment and Ecology   >   Pollution   >   Air pollution

Context: AQI has been dropping in Delhi leading to the initiation of Graded Response Action Plan (GRAP).


About GRAP:

  • The Graded Response Action Plan is a series of emergency measures to tackle air pollution in Delhi once AQI reaches a certain threshold.
  • It was created on the basis of the Supreme Court’s orders in M.C. Mehta v. Union of India (2016).

Actions taken under GRAP:



  • Till 2020, Supreme Court appointed Environment Pollution (Prevention and Control) Authority used to order states to implement GRAP measures.
  • From 2021 onwards, GRAP is being implemented by Commission for Air Quality Management in NCR and Adjoining areas (CAQM).

National Air Quality Index

  • It is a measure of air quality where the higher the number, the worse the air.
  • There are 6 categories of AQI: ‘Good’ (0-50), ‘Satisfactory’ (50-100), ‘Moderately polluted’ (100-200), ‘Poor’ (200-300), ‘Very Poor’ (300-400), and ‘Severe’ (400-500).
  • Pollutants measured:
    • PM10
    • PM2.5
    • Nitrogen Dioxide (NO2)
    • Sulphur Dioxide (SO2)
    • Carbon Monoxide
    • Ozone 
    • Ammonia (NH3)
    • Lead (Pb)
  • It is considered as ‘One Number-One Color-One Description’ to know the air quality in an area.
  • It was launched by the Central Government as part of Swachh Bharat mission in 2014.