Last reviewed on February 25, 2013 at 15:57

Documentation of California's Greenhouse Gas Inventory (5th Edition - Last updated on 02/19/2013)

♦ Category: Energy

IPCC: 1A3biii - Fuel Combustion Activities - Transport - Road Transportation - Heavy-duty Trucks and Buses
Sector: Transportation : On Road : Heavy-duty Vehicles : Heavy-duty Trucks, Buses & Motorhomes

♦ Activity: Fuel combustion - Gasoline

♦ Greenhouse gas: Nitrous oxide ( N2O )

► Year 2000 —

● Greenhouse gas emission estimate —

Amount: 1,364 tonnes of N2O Emitted (422,969 tonnes CO2 Eq.)
Basis: Calculation
Calculation: ([EMFAC vehicle miles traveled] * (0.0318 * ([EMFAC NOx emission] / [EMFAC vehicle miles traveled]) + 0.0167)) * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix]
Reference: ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm

● Activity level used in calculations —

Activity: Fuel combustion = 703,688,282 gal of Gasoline
Basis: Calculation
Calculation: [EMFAC category fuel combustion] * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix]
Reference: ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm
Reference: Not Applicable.

● Parameters and Constants used in calculations —

Parameter: EMFAC category fuel combustion = 705,219,482 gal
Reference: ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm
Parameter: EMFAC NOx emission = 39,143,585,830 g (i.e. 39.14 thousand tonnes)
Reference: ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm
Parameter: EMFAC total fuel combustion = 14,355,311,175 gal
Reference: ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm
Parameter: EMFAC Vehicle miles traveled = 7,342,503,348 mile
Reference: ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm
Parameter: Fraction of fuel mix = 0.996
Reference: ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm
Parameter: Fuel sales = 14,378,254,190 gal
Reference: FHWA (various). US Department of Transportation, Federal Highway Administration - Highway Statistics Series. Motor Fuel. Data accessed online at: http://www.fhwa.dot.gov/policy/ohpi/qffuel.cfm
Constant: Global warming potential of N2O = 310
Reference: IPCC (1996). Second Assessment Report. Climate Change 1995: WG I - The Science of Climate Change. Intergovernmental Panel on Climate Change; J.T. Houghton, L.G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg, and K. Maskell (eds.); Cambridge University Press. Cambridge, U.K.

● Greenhouse gas emitted per unit activity —

Amount: 1.94 g of N2O per gal of Gasoline
601 g of CO2eq. per gal of Gasoline
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