Laws & Regulations
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Overview of the Verification Process for Clean Diesel Technology
The verification process for Clean Diesel technology evaluates the performance and durability of specific emission control devices submitted by manufacturers.
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Confirmatory Testing for Engines and Vehicles
The steps for confirmatory testing for small spark-ignition (SI) and compression-ignition (CI) engines at EPA's National Vehicle and Fuel Emissions Laboratory (NVFEL).
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Compliance Reporting for Portable Fuel Containers
Steps for compliance reporting with EPA for portable fuel containers.
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Transition Program for Equipment Manufacturers (TPEM)
In order to provide flexibility for small equipment manufacturers that must comply with new regulations, EPA created the Transition Program for Equipment Manufacturers, better known as “TPEM” or “flexibility program.”
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Compliance Reporting for Electric Motorcycles
Steps for compliance reporting with EPA for onroad electric motorcycles.
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How to Register for Engines and Vehicles Compliance Information System (EV-CIS)
Registration instructions and account setup for regulated parties of vehicles and engines used for transportation.
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Regulations for Emissions from Commercial Trucks and Buses (Heavy-duty)
This page provides links to regulations for controlling greenhouse gas (GHG) emissions, smog, soot and other air pollution from commercial trucks and buses.
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Proposed Rule and Related Materials for Control of Air Pollution From Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards
Includes links to Federal Register notice, draft regulatory analysis, technical support documents and final rule.
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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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40 CFR part 80 and 40 CFR part 1090 Pending Registration List
This page provides transparency into the process a registration request must undergo before it is activated by EPA.
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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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Region 9: Letter from CARB to EPA for the San Joaquin Valley (Valley) 2018 Plan supersedes past submittal
California Air Resources Board letter submittal to EPA the San Joaquin Valley 2018 Plan for the 1997, 2006, and 2012 PM2.5 Standards and the 2016 Moderate Area Plan for the 2012 PM2.5 Standard as revisions to the California State Implementation Plan (SIP).
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Region 9: Nevada Inadequate Letter (2/17/2000)
This January 12, 2000, letter from EPA transmits the inadequacy finding for transportation conformity purposes the motor vehicle emission budgets in the "Carbon Monoxide Air Quality Implementation Plan for the Clark County Nonattainment Area.