No petrol or diesel-run taxis will be allowed to ply in the National Capital Region from Sunday, May 1, the Supreme Court said today. Cabs with an all-India permit are exempt from the order to convert into CNG-using cars.

The top court today also refused to extend the deadline of April 30 for taxis to convert into CNG. Taxi owners pleaded before the court that there's no technology available in the market to convert a diesel car into one that uses CNG.

"We gave sufficient time for private taxis to convert to CNG and we are not inclined to extend the deadline," the apex court told the private taxi operators.