Gasoline Dispensing Facility Emission Factors

The California Air Resources Board (CARB) updated the total organic gas (TOG) emission factors for California gasoline dispensing facilities (GDF). In California, these facilities distribute approximately 15 billion gallons of gasoline per year to motor vehicles, fuel containers, and gasoline-powered equipment. TOG emissions, which are ozone precursors, can occur at GDFs when gasoline is transferred from delivery vehicles to GDF underground tanks, storage of gasoline at GDF, and transfer of gasoline from GDF underground tanks to motor vehicles, fuel containers, and other gasoline powered equipment. Other emission points include gasoline spillage and permeation of gasoline from dispensing hoses.

The TOG emission factors for California GDF reflect advances in vapor recovery system performance achieved through implementation of CARB's enhanced vapor recovery program and the interaction between GDF vapor recovery systems and vehicles equipped with onboard refueling vapor recovery (ORVR) systems, which first appear with 1998 model-year passenger vehicles and are required on all 2006 model-year vehicles with a gross vehicle weight rating of 10,000 pounds or less.

The technical support for the revised TOG emission factors is found in "Revised Emission Factors for Gasoline Marketing Operations at California Gasoline Dispensing Facilities," which provides a summary of five supporting attachments. The following hyperlinks can be used to access these documents.