New Delhi, Dec 5 (PTI) The Supreme Court on Friday allowed the Commission for Air Quality Management (CAQM) to relax the stringent GRAP-4 (Graded Response Action Plan) curbs to stage 2 to deal with air pollution in the national capital region in view of improvement in the AQI levels.

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.

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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.

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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".

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