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This page provides information about air pollutant emissions from aviation. It includes regulations, guidance, and other information related to aircraft.

Greenhouse Gas Emissions from Aircraft

The United States recently submitted an information paper to the United Nation’s International Civil Aviation Organization (ICAO) that sets out a timeframe for initiating the U.S. domestic regulatory process for addressing greenhouse gas emissions from aircraft under the Clean Air Act.

Beginning the domestic regulatory process lays the groundwork for adopting the international standards currently being developed through ICAO’s Committee on Aviation and Environmental Protection (CAEP), and it responds to the D.C. District Court’s ruling requiring EPA to determine whether greenhouse gas emissions from aircraft cause or contribute to air pollution that may be reasonably anticipated to endanger public health or welfare. The information paper indicates that, under the agency’s current schedule, EPA intends to propose its findings in late April 2015, with final determinations expected in spring 2016.

EPA will follow notice and comment rulemaking procedures for this initial proposed action, providing ample opportunity for stakeholders and the public to provide input, and ensuring transparency.

NOx Emissions from Commercial Aircraft Engines

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Lead Emissions from Piston-Engine Aircraft Using Leaded Aviation Gasoline

The EPA is evaluating the impact of lead emissions from aircraft using leaded aviation gasoline in order to make a determination regarding whether aircraft lead emissions cause or contribute to air pollution which may reasonably be anticipated to endanger public health or welfare. These actions are in response to petitioners’ requests, which are provided below along with the EPA responses to date. The EPA currently intends to issue a proposed finding on the question of endangerment in 2017. This proposed finding will then undergo public notice and comment. After evaluating comments on the proposal, we plan to issue a final endangerment finding in 2018. Documents and information relevant to the EPA’s ongoing evaluation and other EPA activities regarding lead in air are provided below.

In separate activities related to the National Ambient Air Quality Standards for lead, EPA finalized revisions to the ambient monitoring requirements for measuring lead in the air on December 14, 2010. These amendments expanded the nation's lead monitoring network to better assess compliance with the 2008 National Ambient Air Quality Standards for lead. EPA required the continuation of monitoring at airports emitting at least one ton of lead per year. EPA also required the states to conduct a year-long monitoring study at 15 airports that emit less than one ton per year to determine how these sources impact air quality.

The following documents provide information on inventory documentation and additional data:

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This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
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