Bus operators should do more to tackle pollution and improve the environment, passengers told a Transport Department survey. The findings of the study may result in more anti-pollution measures targeting buses, although Commissioner for Transport Robert Footman declined to go into specifics until the year-long survey was completed. 'Bus passengers themselves are saying they want the bus companies to do more to help improve the environment,' Mr Footman said. 'Passengers are generally pretty satisfied with bus services, which they said had improved significantly in recent years, but they are also saying we need to improve in certain areas, with the environment being one of them.' New government anti-pollution measures announced last week include a shift to ultra-low sulphur diesel by all government diesel vehicles and franchised buses, trials of hybrid natural gas and fuel cell-powered vehicles and the mandatory installation of fuel pump vapour recovery systems at filling stations. The bus survey is studying the full range of passenger services. It follows similar surveys on ferries and taxis, which led to proposals to make new taxi drivers take courses in basic English and Putonghua, taxi regulations and road safety. The results of the ferry survey will be released next month.