Natural gas fueling station, San Jose International Airport, California, USA. Compared to traditional gasoline-powered vehicles, natural gas vehicles have much lower emissions and hence are more environmentally friendly. Over the recent years they have been gaining more popularity and the necessary network of fueling stations is being built, particularly in densely populated areas like San Francisco Bay Area. Shown here is the state-of-the-art compressed natural gas (CNG) fueling station located at San Jose International Airport, opened in 2003. It is owned by the airport and was built primarily for fueling airport shuttle buses (like the one shown here), taxis and service vehicles. However, the general public is also encouraged to use the facility. September 2007.