Around 48 lakh vehicles that do not meet BS-VI emission standards are registered in National Capital Region (NCR) districts near Delhi, posing a major enforcement challenge as restrictions on older petrol and diesel vehicles entering the capital come into force today, November, 1, 2026. As per The Indian Express report, the restrictions will remain in force until January 31, 2027, and will apply to non-Delhi-registered petrol and diesel vehicles that are below BS-VI emission standards.