Greenhouse Gas Emissions by Transportation Mode: 2019

percent of Tg CO₂ Eq.


Percents may not add to 100 due to rounding. Does not include International Bunker Fuels.

Key: Tg CO₂ Eq. = teragrams of carbon dioxide equivalent. A teragram = 1 million metric tons.


U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks, report tables available at

Last Updated: May 2021