Story by Bahari Duniya | Written by Ranjan Sharma

As Delhi grapples with deteriorating air quality, the city has activated GRAP Stage IV, bringing new restrictions on vehicle movement, fuel dispensing, and construction activities. Under these rules, BS4 diesel vehicles are completely barred from operating or entering the city. Fuel stations have been instructed to follow a strict “No PUC, No Fuel” directive, ensuring that petrol and diesel are provided only to vehicles that meet emission standards and carry a valid Pollution Under Control (PUC) certificate.
Any vehicle found non-compliant during checks may be refused fuel and could face penalties. Stage IV of the Graded Response Action Plan is triggered when the air quality index reaches the Severe category, highlighting the urgency of controlling pollution sources.
Delhi Roads and BS6 Diesel Cars: What the Rules Say
Yes, BS6 diesel passenger vehicles are allowed to run in Delhi during GRAP Stage IV, provided they follow the required regulations. Vehicle owners must ensure:
- No visible emission violations
- Compliance with on-ground enforcement checks
- A valid PUC certificate
While allowed, authorities continue to advise citizens to avoid non-essential travel to reduce overall vehicular emissions.
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Why Diesel Vehicles Are Subject to Tighter Checks
Diesel vehicles are major contributors to particulate pollution, especially in cold winter months. Consequently, GRAP Stage IV targets older diesel vehicles for stricter restrictions, while BS6 diesel vehicles are permitted as the cleanest alternative among traditional internal combustion engines.
What Every BS6 Vehicle Owner Needs to Know
At present, BS6 diesel car owners are allowed to operate in Delhi despite GRAP Stage IV restrictions, as they are considered the cleanest diesel option available. However, authorities continue to carry out strict enforcement, including checks on Pollution Under Control (PUC) certificates, fuel eligibility, and vehicle emissions across the city. Petrol and diesel are supplied only to vehicles meeting emission norms. These restrictions will remain in place until there is a significant improvement in air quality, and officials formally roll back Stage IV measures, ensuring compliance remains a priority.
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