In a major step towards reducing pollution in the city, Indian Oil Corporation has started supplying ultra-low sulphur diesel with sulphur content of 0.05 per cent in the National Capital Region. This diesel will come from IOC's Mathura refinery.The first consignment carrying this "green" fuel reached Delhi Transport Corporation's Indraprastha depot on Wednesday morning and was received by Indian Oil's executive director (northern region) Narender Singh and DTC officials.