Golden Gate Going Green

Emissions Reductions at GGT - Updated October 2009

In 2001, the California Air Resources Board (CARB) adopted new emission regulations for public transit operators in California. By September 2006, GGT met and exceeded CARB regulations by reducing Particulate Matter (PM) bus emissions by approximately 90%; the CARB regulation was to reduce emissions by 85% by 2007. By 2006, GGT was also able to reduce oxides of nitrogen (NOx) emissions by 25%. These reductions were achieved through several key initiatives:

  • Purchased 90 new replacement buses, all equipped with the cleanest operating technology available
  • Began fueling all GGT buses with ultra-low sulfur diesel
  • Repowered 31 buses with new low-emission diesel engines
  • Retrofitted 46 buses purchased between 1996 and 1999 with filters to reduce PM by 85% and nitrogen oxides by 25%
  • Partnered with AC Transit in a joint demonstration project for the development of several "Zero Emission Buses" powered by hybrid electric hydrogen fuel cell technology
  • Partnered with the Bay Area Air Quality Management District and the Metropolitan Transportation Commission to provide free transit rides on "Spare the Air" days to reduce auto emissions
  • Tested new oil filtration devices aimed at extending the interval between oil changes, reducing the amount of engine oil used by half
  • Added 10 new high-capacity articulated buses with the latest clean diesel engines
  • Performing oil analysis to determine the "life-cycle" of all lubrication fluids on buses
  • Using synthetic oil in bus transmissions, coupled with oil analysis, to reduce oil use by 400%

Find out how much you save by riding public transportation by completing this online calculator!



Learn more about the District's green program: