The Delhi Transport Corporation (DTC) added four hybrid buses, introduced for the first time in India, to its fleet for providing world-class transport services during the Commonwealth Games 2010. The chief Minister, Sheila Dikshit on September 17, 2010 launched CNG-electric hybrid buses, provided by Tata Motors, at a function to inaugurate a bus deport in north-east Delhi. The national capital became the first city in the country to introduce environment friendly low-floor CNG-electric hybrid buses having almost zero pollution level for its public transportation. A hybrid electric bus combines a conventional internal combustion engine propulsion system with an electric propulsion system. The low-floor air-conditioned bus provides 32 seats for passengers and also accommodates wheel chairs.