Delhi bans BS3 Petrol, BS4 Diesel Vehicles; know why?

The government of Delhi temporarily banned the use of BS3 petrol and BS4 diesel vehicles in the nation’s capital on Monday to reduce air pollution levels after the city’s air quality once again worsened. Due to unfavourable conditions, including calm breezes and low temperatures, the Commission for Air Quality Management (CAQM) instructed all NCR states to intensify their implementation of anti-pollution controls.