Delhi AQI Update: Supreme Court allows relaxation of GRAP-4 measures as air quality improves

The Supreme Court on Friday, December 5 permitted the Commission for Air Quality Management (CAQM) to reduce the strict GRAP-4 (Graded Response Action Plan) limitations on air pollution in the national capital region (NCR) to stage 2. This was due to improved AQI measurements in the city.

A bench of Justices Abhay S Oka and Augustine George Masih suggested the CAQM to include some additional measures of GRAP-3 in stage-2 curbs.

The bench told the CAQM that stage 3 curbs would be introduced if AQI (air quality index) crossed the 350 mark and stage-4 curbs if AQI crossed 400.

The top court noted the AQI level in NCR did not cross 300 in the last four days.
An AQI between zero and 50 is considered "good"; 51 and 100 is "satisfactory"; 101 and 200 is "moderate"; 201 and 300 is "poor"; 301 and 400 is "very poor"; whereas between the range 401 and 500 it is "severe".

With inputs from agencies