GRAP (Graded Response Action Plan) Stage 4 is the strictest level of anti-pollution measures enforced in Delhi-NCR. It is triggered when air quality slips into the “Severe Plus” category, typically when the AQI crosses 450 or is forecast to remain extremely poor.

The measures are implemented by the Commission for Air Quality Management (CAQM) to protect public health during extreme pollution episodes. Advertisement

What Is Restricted Under GRAP-4

All trucks are barred from entering Delhi, except those: carrying essential goods, providing essential services, or running on CNG, LNG, electric power, or BS-VI diesel.

Light commercial vehicles (LCVs) registered outside Delhi are banned unless they meet clean-fuel norms or carry essential supplies.

Delhi-registered BS-IV and older diesel

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