Transportation and Air Quality
- How much air pollution does a car produce when it’s moving and when it’s idling?
- What can I do about a car, heavy-duty truck, or train idling near my house?
What's New in OTAQ
OTAQ Recent Additions
- December 3: EPA and DOE release annual Fuel Economy Guide with 2014 models.
- November 15: EPA proposes RFS volume standards for 2014.
OTAQ Press Releases
- November 20, 2013: EPA Awards $556,650 to Help Massachusetts Marine Vessels Reduce Diesel Emissions
- November 20, 2013: EPA Offers Funding to Reduce Pollution from Diesel Engines
- November 15, 2013: EPA Proposes 2014 Renewable Fuel Standards / Proposal Seeks Input to Address “E10 Blend Wall,” Reaffirms Commitment to Biofuels
OTAQ Federal Register Notices
- November 29, 2013: 2014 Standards for the Renewable Fuel Standard Program
- November 29, 2013: Notice of Receipt of Petitions for a Waiver of the Renewable Fuel Standard
- November 29, 2013: Information Collection Request Submitted to OMB for Review and Approval; Comment Request; Emission Control System Performance Warranty Regulations and Voluntary Aftermarket Part Certification Program (Renewal)
EPA's Office of Transportation and Air Quality protects public health and the environment by regulating air pollution from motor vehicles, engines, and the fuels used to operate them, and by encouraging travel choices that minimize emissions. These "mobile sources" include cars and light trucks, heavy trucks and buses, nonroad engines, equipment, and vehicles. For more information see:
- About the Office of Transportation and Air Quality (OTAQ)
- About the National Vehicle and Fuel Emissions Laboratory (NVFEL)
OTAQ's top sites
OTAQ's programs and website topics (A detailed list of programs and topics is on our site map.)
Overview:Pollutants & Programs
Information on how much air pollution, air toxics, and greenhouse gases are emitted by mobile sources, the programs OTAQ has undertaken to control these emissions, and the impact of those programs on air quality and climate change.
On-Road Vehicles & Engines
Information about fuel economy, emission standards and regulations, emission recall, certification and compliance, inspection and maintenance, diesel retrofit, evaluating the benefits of inventions designed to reduce emissions, and importing vehicles and engines.
Nonroad Engines, Equipment
Information about nonroad engines, equipment and vehicles: emission standards and regulations, certification and compliance, and diesel retrofit programs.
- Diesel Boats & Ships
- Gasoline Boats & Personal Watercraft
- Nonroad Diesel Equipment
- Forklifts, Generators & Compressors
- Lawn & Garden
- Snowmobiles, Dirt Bikes, & ATVs
Fuels & Fuel Additives
State & Local Transportation
Modeling, Testing, & Research
Information on modeling and inventories for estimating emissions from highway vehicles, nonroad sources, and fuels; testing and measuring emissions; research into clean automotive technologies; and emission factors research.