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Graded Response Action Plan (GRAP)

  • The System is designed to predict extreme air pollution events and give alerts to take necessary steps as per Graded Response Action Plan (GRAP) of the Government of India.
  • An emergency protocol under the Graded Response Action Plan which involve a series of measures on basis of the Air Quality Index are set to be implemented. When the mark is between moderate and poor category, the burning of garbage will be stopped and pollution control regulations will be enforced.
  • If the air quality drops to very poor category, additional measures will be taken including stopping of diesel gensets, enhancing parking fees and increasing frequency of metro and buses.
  • For severe and very severe category air quality, additional measures would include frequent mechanised cleaning of roads and sprinkling of water, stopping entry of trucks, stopping construction activities and appointment of task force to take decisions like shutting of schools.

About Environment Pollution Control Authority (EPCA):

  • EPCA was constituted with the objective of ‘protecting and improving’ the quality of the environment and ‘controlling environmental pollution’ in the National Capital Region. The EPCA also assists the apex court in various environment-related matters in the region.
  • EPCA is Supreme Court mandated body tasked with taking various measures to tackle air pollution in the National Capital Region. It was notified in 1998 by Environment Ministry under Environment Protection Act, 1986.


Besides the chairman, the EPCA has 14 members, some of whom are the environment secretary of the National Capital Territory of Delhi (NCT), chairperson of the New Delhi Municipal Council, transport commissioner of the NCT, the commissioners of various municipal corporations of Delhi and professors at IIT Delhi and Jawaharlal Nehru University.


  • To protect and improve quality of environment and prevent and control environmental pollution in National Capital Region.
  • To enforce Graded Response Action Plan (GRAP) in NCR as per the pollution levels.

Key facts:

  • An AQI in the range of 0-50 is considered ‘good’, 51-100 ‘satisfactory’, 101-200 ‘moderate’, 201-300 ‘poor’, 301-400 ‘very poor’ and 401-500 ‘severe’.
  • The Supreme Court has empowered the Environment Pollution Control Authority(EPCA) to take various measures to tackle pollution. Under the order, the EPCA has mandated enforcement of Graded Response Action Plan (GRAP) in the city.

Air Quality Early Warning System for Delhi launched Early Warning System can predict extreme air pollution events 72 hours in advance and give necessary alerts

Developed by

The air pollution system has been developed jointly by the scientists at Indian Institute of Tropical Meteorology (IITM), Pune, India Meteorological Department and National Centre for Medium Range Weather Forecasting (NCMRWF).

Connect to the early warning system

  • The early warning system will help in proactively forewarning, 3-4 days in advance, any large scale air pollution events which may occur over the Delhi region.
  • The Central Pollution Control Board (CPCB) has constituted a 41 member team which will continuously monitor the air pollution levels in Delhi and NCR region and will report to the board.
  • The warning system consists of
  1. a) real time observations of air quality over Delhi region and details about natural aerosols like dust (from dust storms) and particulate matter using different satellite data sets
  2. b) Predictions of air pollutants from two different air quality prediction systems based on state-of-the-art atmospheric chemistry transport models and c) Warning Messages and Alerts and Bulletins.

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