GRAP-4 Curbs Reimposed In Delhi-NCR As Air Quality Turns 'Severe'

New Delhi: The Centre's pollution watchdog on Saturday invoked curbs under Stage 4 of the Graded Response Action Plan (GRAP) in Delhi-NCR as the capital's air quality deteriorated to enter the 'severe' category, according to officials.

"The AQI of Delhi, which was recorded as 400 on Saturday at 4 pm, exhibited a sharp increasing trend and has been recorded at 428 at 8 pm owing to a western disturbance, highly unfavourable weather and meteorological conditions, and lack of dispersal of pollutants," said a senior official of the Commission for Air Quality Management (CAQM).

"Keeping in view the prevailing trend of air quality and relevant factors and in an effort to prevent further deterioration of air quality in the region, the CAQM Sub-Committee on GRAP unanimously decides to invoke all actions as envisaged under Stage-IV of extant GRAP – 'Severe+' Air Quality (DELHI AQI > 450), with immediate effect, in the entire NCR, as a proactive measure," the official said.

This comes a day after the CAQM enforced GRAP 3 restrictions in Delhi-NCR on Friday. GRAP categorises air quality into four stages -- 'poor' (AQI 201-300), 'very poor' (AQI 301-400), 'severe' (AQI 401-450) and 'severe plus' (AQI above 450).

A new restriction introduced under GRAP-4 in December 2025 was a ban on vehicles entering Delhi that are not BS-VI compliant (including those running on petrol) and do not have a Delhi registration. This will be in force again.

Entry of non-essential trucks into Delhi will also be banned. Exceptions are made for trucks carrying essential goods or services, or those running on cleaner fuels such as LNG, CNG, electric, or BS-VI diesel.

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Grap 3 Curbs Enforced In Delhi-NCR As Air Quality Likely To Turn 'Severe' In Coming Days