Last reviewed on 06-22-2018

Documentation of California's Greenhouse Gas Inventory (11th Edition - Last updated on 11-06-2019)

♦ Category: Energy

IPCC: 1A3bii - Fuel Combustion Activities - Transport - Road Transportation - Light-duty Trucks
Sector: Transportation : On Road : Light-duty Vehicles : Light-duty Trucks & SUVs

♦ Activity: Fuel combustion - Ethanol

♦ Greenhouse gas: Methane ( CH4 )

► Year 2004 —

● Greenhouse gas emission estimate —

Amount: 449.88 tonnes of CH4 Emitted (11,247 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [EMFAC CH4 emission] * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix]
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See Discussion of emissions from on-road transportation available at: ttps://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf#https://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf

● Activity level used in calculations —

Activity: Fuel combustion = 374,550,904 gal of Ethanol
Basis: Calculation
Calculation: [EMFAC category fuel combustion] * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix]
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See Discussion of emissions from on-road transportation available at: ttps://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf#https://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf
Reference: Not Applicable.

● Parameters and Constants used in calculations —

Parameter: EMFAC category fuel combustion = 7,193,946,177 gal
Reference: ARB (2017b). The California Air Resources Board's Emission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars and heavy-duty trucks, operating on highways, freeways, and local roads in California. Model and documentation available online at: /msei/msei.htm
Parameter: EMFAC CH4 emission = 8,640,724,681 g (i.e. 8.64 thousand tonnes)
Reference: ARB (2017b). The California Air Resources Board's Emission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars and heavy-duty trucks, operating on highways, freeways, and local roads in California. Model and documentation available online at: /msei/msei.htm
Parameter: EMFAC N2O emission = 7,229,620,322 g (i.e. 7.23 thousand tonnes)
Reference: ARB (2017b). The California Air Resources Board's Emission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars and heavy-duty trucks, operating on highways, freeways, and local roads in California. Model and documentation available online at: /msei/msei.htm
Parameter: EMFAC total fuel combustion = 15,883,435,858 gal
Reference: ARB (2017b). The California Air Resources Board's Emission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars and heavy-duty trucks, operating on highways, freeways, and local roads in California. Model and documentation available online at: /msei/msei.htm
Parameter: Fraction of fuel mix = 0.0521
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See Discussion of emissions from on-road transportation available at: ttps://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf#https://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf
Parameter: Fuel sales = 15,882,228,670 gal
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: ttp://www.cdtfa.ca.gov/taxes-and-fees/spftrpts.htm#http://www.cdtfa.ca.gov/taxes-and-fees/spftrpts.htm
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.). http://www.ipcc.ch/publications_and_data/publications_ipcc_fourth_assessment_report_synthesis_report.htm

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

Amount: 1.2 g of CH4 per gal of Ethanol
30 g of CO2eq. per gal of Ethanol
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