Graded Response Action Plan (GRAP) is a mechanism to decide the actions that governments in Delhi-NCR must take as the levels of air pollution rise through various stages. The idea of GRAP is to put certain steps or restrictions in place as soon as air pollution reaches a specific level, instead of waiting for the air to become worse.

The GRAP framework was approved by the Supreme Court in 2016, and its implementation has since been overseen by the CAQM. The watchdog’s suggestion to the Supreme Court on November 19 was part of a new set of interventions it was required to present before the court.

There are four stages in GRAP, each linked to the Air Quality Index (AQI) at the time.

# The first stage, or Stage I of GRAP, kicks in when the air turns “poor” (AQI of 201-300, which causes b

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