Laws & Regulations
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Light-duty Models for Greenhouse Gas (GHG) Emissions
This page links to models and modeling systems related to GHG emissions.
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Regulations for Emissions from Heavy Equipment
This page provides links to regulations for controlling emissions from heavy equipment.
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Regulations for Emissions from Marine Vessels
This page provides links to regulations for controlling emissions from marine vessels.
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Supporting Documents for Diesel Fuel Standards
Compliance and supporting documents on vehicles and fuel requirements for diesel fuel standards.
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Certification and Compliance Testing at the National Vehicle and Fuel Emissions Laboratory (NVFEL)
This page provides links to vehicle and engines' certification and testing resources.
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General Information for Transportation and Conformity
Transportation conformity is required by the Clean Air Act section 176(c) (42 U.S.C. 7506(c)) to ensure that federal funding and approval are given to highway and transit projects that are consistent with SIP.
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State Implementation Plans (SIP): Submissions that EPA has Found Adequate or Inadequate
EPA/OTAQ’s State and Local Transportation Resources are for air quality and transportation government and community leaders. Information on state implementation plans (SIPs) that EPA has found either adequate or inadequate is provided here.
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Adequacy Review of State Implementation Plan (SIP) Submissions for Conformity
This page is for state and local air quality regulators and transportation planners that offers guidance on how to reduce air pollution from cars, diesel trucks, city and school buses, construction equipme
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Document Schema for EMTS
Users can find XML definitions that can be used to parse reports and documents generated by EMTS.
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Hardship Exemptions for Gasoline
Certain EPA emissions and fuel regulations provide for regulatory relief in specified circumstances when a regulated party can demonstrate that compliance would impose severe hardship.
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Gasoline Winter Oxygenates
Without oxygenated gasoline, carbon monoxide emissions from gasoline-fueled vehicles tend to increase in cold weather. Winter oxygenated gasoline programs are implemented by the states.
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Emergency Fuel Waivers
Temporary waivers due to emergency situations when the fuel supply suffers major disruption.
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State Gasoline Standards
The federal Clean Air Act establishes national fuel emission standards, but also allows states to adopt unique fuel programs to meet local air quality needs.
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Registered Gasoline Additives
Gasoline and gasoline additives produced and commercially distributed for use in highway motor vehicles must be registered.
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Gasoline Sulfur & Benzene Credits
This page contains information related to the migration of the Sulfur and Benzene Averaging, Banking, and Trading (ABT) program and EPA's Moderated Transaction System.
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Gasoline Programs
This section contains an overview of the key elements of the federal and state gasoline standards.
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Regulations for Gasoline Standards
This section contains the applicable statutes, federal regulations and state standards for the gasoline program.
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Fuel Waivers & Exemptions
This section contains information on fuel waivers and hardship exemptions related to gasoline.
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Compliance for Gasoline Standards
For an overview of compliance and related issues under the gasoline programs.
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E10 Fuel Waivers
This page contains information about E10 fuel waivers.