Amid deteriorating air quality in the National Capital Region (NCR), the Graded Response Action Plan (GRAP) Stage 4 measures have been implemented starting Monday to curb emissions and combat pollution.

GRAP Stage 4 anti-pollution measures have been imposed in Delhi-NCR and will come into force from Monday as air quality in Delhi has plunged to the "severe" category.

The Commission for Air Quality Management (CAQM) has implemented Stage-IV (Severe+) actions under the Graded Response Action Plan (GRAP) in Delhi-NCR,

Under GRAP Stage 4, there will be a ban on diesel-run medium, heavy goods vehicles registered in Delhi, except those carrying essentials.

On Sunday, Delhi experienced a marked increase in its average Air Quality Index (AQI). In the space of a few hours, from 4 PM to 7 PM, the AQI jumped from 441 to 457, an alarming spike confirmed by the Central Pollution Control Board (CPCB).

Delhi NCR is implementing GRAP Stage 3 due to severe air quality, halting non-essential construction and restricting vehicle use. The region's AQI has reached hazardous levels, prompting authorities to enforce stricter measures like banning certain vehicles and limiting construction activities to combat pollution.

Delhi's air quality remained "severe" for a second consecutive day, prompting the central pollution watchdog to invoke restrictions under the third stage of GRAP, including a ban on construction activ

The GRAP 3 curbs in Delhi include ban on demolition and construction activities, and entry of certain vehicles inside Delhi-NCR, among other curbs, to prevent further deterioration of air quality.