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The transportation sector accounted for nearly 29% of GHG emissions in the United States in 2019, with 58% of emissions coming from light-duty vehicles. {{As of|2021}}, states lack legislation for [[Low-emission zone|low emission zones]]. Programs to reduce greenhouse gas emissions from the transportation sector include:
* The [[Corporate Average Fuel Economy]] (CAFE) Program: Requires automobile manufacturers to meet average fuel economy standards for the light-duty vehicles, large passenger vans and [[SUV]]s sold in the United States. Fuel economy standards vary according to the size of the vehicle.
* [[SmartWay]]: Helps improve environmental outcomes for companies in the freight industry.
* [[Renewable Fuel Standard]]: Under the [[Energy Policy Act of 2005]], [[United States Environmental Protection Agency]] is responsible for promulgating regulations to ensure that gasoline sold in the United States contains a specific volume of [[renewable fuel]].
* [[FreedomCAR]] and Fuel Partnership and [[Vehicle Technologies Program]]: The program works jointly with DOE's hydrogen, fuel cell, and infrastructure R&D efforts and the efforts to develop improved technology for [[hybrid electric vehicle]]s, which include components (such as [[rechargeable battery|batteries]] and [[electric motor]]s). The U.S. government uses six "[[criteria pollutant]]s" as indicators of [[air quality]]: [[ozone]], [[carbon monoxide]], [[sulfur dioxide]], [[nitrogen oxide]]s, [[Atmospheric particulate matter|particulate matter]], and [[lead]] and does not include [[carbon dioxide]] and other [[greenhouse gas]]es.
* [[Clean Cities Coalition Network|Clean Cities]]: A network of local coalitions created by DOE in 1993 that works to support energy efficiency and clean fuel efforts in local transportation contexts.
* Congestion Mitigation and Air Quality Improvement (CMAQ) Program: Provides funds to states to improve air quality and congestion through the implementation of surface transportation projects (e.g., traffic flow and public transit improvements).
* Aviation industry regulation: Emissions from commercial and business jets make up 10% of U.S. transportation sector emissions and 3% of total national GHG emissions. In 2016, the EPA issued an "endangerment finding" that allowed the agency to regulate aircraft emissions, and the first proposed standards under that legal determination were issued in July 2020.
* Developing alternative energy sources: The Department of Energy's Bioenergy Technologies Office (BETO) supports research into [[biofuel]]s as part of that agency's efforts to reduce transportation-related GHG emissions.
* Diesel Emissions Reduction Act (DERA) Program: Provides grants for diesel emissions reduction projects and technologies.

Translations:Greenhouse gas emissions by the United States/28/en - Revision history

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