* Direct emissions are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) emissions that occurred at the vehicle when fuel was consumed. Indirect emissions are CO2, CH4, and N2O emissions that occurred at the power plant when electricity was produced or in the process of producing hydrogen.
** Upstream emissions are GHG emissions that occurred during fuel production and distribution, also called “well-to-pump†emissions.
Citation formats
Public transport's GHG emissions in the U.S., by transit authority 2018
In 2018, the public transit agency that emitted the most greenhouse gases (GHG) in the United States was the MTA New York City Transit with more than * metric tons on COâ‚‚ equivalent. It was followed by NJ Transit with GHG emissions of almost ** metric tons of COâ‚‚ equivalent.
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NASEM (Transit Cooperative Research Program (TCRP)). (December 31, 2021). Public transport's greenhouse gas (GHG) emissions of selected transit agencies in the United States in 2018 (in 1,000 metric tons of COâ‚‚e) [Graph]. In ÌÇÐÄÆÆ½â°æ. Retrieved July 27, 2026, from /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/
NASEM (Transit Cooperative Research Program (TCRP)). "Public transport's greenhouse gas (GHG) emissions of selected transit agencies in the United States in 2018 (in 1,000 metric tons of COâ‚‚e)." Chart. December 31, 2021. ÌÇÐÄÆÆ½â°æ. Accessed July 27, 2026. /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/
NASEM (Transit Cooperative Research Program (TCRP)). (2021). Public transport's greenhouse gas (GHG) emissions of selected transit agencies in the United States in 2018 (in 1,000 metric tons of COâ‚‚e). ÌÇÐÄÆÆ½â°æ. ÌÇÐÄÆÆ½â°æ Inc.. Accessed: July 27, 2026. /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/
NASEM (Transit Cooperative Research Program (TCRP)). "Public Transport's Greenhouse Gas (Ghg) Emissions of Selected Transit Agencies in The United States in 2018 (in 1,000 Metric Tons of Coâ‚‚e)." ÌÇÐÄÆÆ½â°æ, ÌÇÐÄÆÆ½â°æ Inc., 31 Dec 2021, /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/
NASEM (Transit Cooperative Research Program (TCRP)), Public transport's greenhouse gas (GHG) emissions of selected transit agencies in the United States in 2018 (in 1,000 metric tons of COâ‚‚e) ÌÇÐÄÆÆ½â°æ, /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/ (last visited July 27, 2026)
Public transport's greenhouse gas (GHG) emissions of selected transit agencies in the United States in 2018 (in 1,000 metric tons of COâ‚‚e) [Graph], NASEM (Transit Cooperative Research Program (TCRP)), December 31, 2021. [Online]. Available: /statistics/1294703/us-public-transport-ghg-emissions-by-transit-authority/