# TD 4-2: Greenhouse Gas Emissions by Transportation Sector (Thousands of metric tons of CO2 Equivalents)

Total refers to Transportation, all modes.

Transportation Total does not include hydrofluorocarbons (HFCs). HFC’s associated with transport vehicles are reported in the Industrial Process Sector of Canada’s GHG Inventory.

Each category reported includes the non-CO2 emissions resulting from the combustion of Biogenic fuels in that category in Canada. Therefore, these values include CH4 and N2O emissions from both fossil AND biogenic fuels as well as CO2 from fossil fuels. Biogenic Fuels (Biodiesel/Ethanol) are presumed to be evenly distributed throughout the fossil based fuels that they offset.

Air refers to civil aviation; emissions resulting from the consumption of fuels by airlines flying domestically.

Road includes the following vehicle types: light-duty gasoline vehicles, light-duty gasoline trucks, heavy-duty gasoline vehicles, motorcycles, light-duty diesel vehicles, light-duty diesel trucks, heavy-duty diesel vehicles, propane and natural gas vehicles.

Road: emissions resulting from the consumption of fuels by vehicles licensed to operate on roads.

Rail: emissions resulting from the consumption of fuels by railways purchasing fuel in Canada.

Marine refers to domestic marine; emissions resulting from the consumption of fuels by Canadian registered marine vessels fuelled domestically.

Other includes: off-road gasoline, off-road diesel, pipelines.

Other – off road: emissions resulting from the consumption of fuels by combustion devices not licensed to operate on roads.

Other – Pipelines: emissions resulting from the transportation and distribution of crude oil, natural gas, and other products.

Emissions from Biofuels are reported within the fossil fuel transportation sub-categories that they displace.

CO2 refers to carbon dioxide; CH4 refers to methane; N2O refers to nitrous oxides.

1 thousand metric tons of CO2 equivalents = 1 gigagram of CO2 equivalents.

Mexico

Road: is a combination of data for passenger cars, light-duty trucks and other trucks. Emissions in this sector come from the consumption of Gasoline, Diesel, LPG and natural gas.

Air: refers to domestic aviation. Domestic aviation emissions come from the consumption of jet fuel and gasoline. Emissions from international aviation transport (also known as international bunker fuel emissions) are excluded from national totals.

Rail: transport emissions consist only of diesel consumption.

Marine: refers to domestic marine. Domestic marine emissions come from the consumption of diesel and fuel oil. Emissions from international maritime transport (also known as international bunker fuel emissions) are excluded from national totals.

Data may not add due to rounding.

National Greenhouse Gas Emissions Inventory are updated with 2013 data, incorporating methodological changes, activity data with a level of disaggregation by source, plant, equipment or unit and also estimates of some sectors with emission factors according to domestic circumstances. The above led a discontinuity between the emission results of the 1990-2012 historical series with 2013 data year.

Motor Vehicle Emission Simulator (MOVES) was used to modeling road transport in 2013, considering the emissions of non-road vehicles for agricultural and construction machinery in 2013.

Global Warming Potential data published in the IPCC Fifth Assessment Report was used for estimating emissions of CO2 equivalents.

United States

Data are in terms of CO2 equivalents.

Aircraft emission: consists of emissions from jet fuel consumed by domestic operations of commercial aircraft (not bunkers), general aviation, and military aircraft.

Marine emissions of CH4 for 1990, 1995, 2000, and 2005-09 are less than 50 Gigagrams of CO2 equivalents. Fluctuations in these estimates are associated with fluctuations in reported fuel consumption, and may reflect data collection problems.

Other CO2 emissions consists of the emissions of pipelines and lubricants.

Motorcycles are included in Other CO2 emissions category prior to 2005.