Last reviewed on 10-02-2020

Documentation of California's Greenhouse Gas Inventory (13th Edition - Last updated on 10-15-2020)

♦ Category: Energy

IPCC: 1A3aii - Fuel Combustion Activities - Transport - Civil Aviation - Domestic Aviation
Sector: Transportation : Aviation : Domestic Air transport

♦ Activity: Fuel combustion - Aviation gasoline

♦ Greenhouse gas: Methane ( CH4 )

► Year 2015 —

● Greenhouse gas emission estimate —

Amount: 119.73 tonnes of CH4 Emitted (2,993 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Fuel combustion] * [Heat content] * [Fuel CH4 emission]
Reference: IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T., and Tanabe K. (eds). Volume 2, Chapter 2: Stationary Combustion. Published: IGES, Japan.

● Activity level used in calculations —

Activity: Fuel combustion = 16,629,545 gal of Aviation gasoline
Basis: Data
Reference: CDTFA (2019). [Formerly referred to as Board of Equalization (BOE)]. California Department of Tax and Fee Administration. Fuel Taxes Statistics & Reports - Motor Vehicle Fuel. Accessed online at:

● Parameters and Constants used in calculations —

Parameter: Fuel CH4 emission = 6.000E-05 g / btu
Reference: USEPA (2013). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. United States Environmental Protection Agency. EPA 430-R-13-001. Annex 3.2. Methodology for Estimating Emissions of CH4, N2O, and Indirect Greenhouse Gases from Mobile Combustion. April 12, 2013. Washington DC. #
Parameter: Heat content = 120,000 btu / gal
Reference: ARB Mandatory Reporting of Greenhouse Gas Regulation. Subpart C of 40 CFR Part 98 (98.30 to 98.38). Available online at:
Constant: Global warming potential of CH4 = 25
Reference: IPCC (2007). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Solomon S., Qin D., Manning M., Chen Z., Marquis M., Averyt K.B., Tignor M., and Miller H.L. (eds.). #

● Greenhouse gas emitted per unit activity (derived from values listed above) —

Amount: 7.2 g of CH4 per gal of Aviation gasoline
180 g of CO2eq. per gal of Aviation gasoline