It is an action plan for stricter measures to fight air pollution came into force in Delhi and its neighbourhood.

• It is an institutionalised response to the deterioration of air quality, has been in effect for two years in Delhi and the National Capital Region (NCR).

• It was approved by the Supreme Court in 2016, and notified in 2017. It comprises a series of measures that come into force incrementally as pollution increases.
• GRAP is an emergency measure. It does not include the action that various state governments are expected to take throughout the year to tackle industrial, vehicular, and combustion emissions.
• When the air quality moves from the ‘Poor’ to the ‘Very poor’ category, the measures listed under both categories (‘Poor’ as well as ‘Very poor’) have to be followed.
• If air quality reaches the ‘Severe+’ stage, GRAP mandates that schools must be shut down, and the odd-even road-space rationing scheme must be implemented.