Transportation and Air Quality
- What is the federally mandated warranty for emission controls on my car?
- Why is there ethanol in gasoline?
- Does the fuel used in fuel economy testing contain ethanol?
What's New in OTAQ
OTAQ Recent Additions
- September 22, 2016: SmartWay webinar: 2016 Shipper Tool Demonstration will take place on Wednesday, October 19, 2016, 2:00 PM - 3:00 PM (ET).
- September 22, 2016: SmartWay webinar: Showcasing Your Pollution Reductions Using the Shipper Tool’s "Shipper Strategies” Tab will take place on Tuesday, October 25, 2016, 2:00 PM - 3:00 PM (ET).
- August 16, 2016: EPA and DOT Finalize Greenhouse Gas and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles.
OTAQ Press Releases
- October 20, 2016: EPA awards clean diesel grant to Port of Baltimore To improve air quality, fuel efficiency
- October 5, 2016: EPA SmartWay Honors CRST Expedited, Inc., of Cedar Rapids, Iowa, for Exceptional Supply Chain Environmental and Energy Efficiency
- October 5, 2016: EPA SmartWay Honors Convoy Systems, LLC, of Kansas City, Kan., for Exceptional Supply Chain Environmental and Energy Efficiency
OTAQ Federal Register Notices
- September 21, 2016: Information Collection Request Submitted to OMB for Review and Approval; Comment Request; Registration of Fuels and Fuel Additives-- Health-Effects Research Requirements for Manufacturers (Renewal)
- September 16, 2016: Agency Information Collection Activities; Proposed Collection; Comment Request; Information Collection for Importation of On-Highway Vehicles and Motorcycles and Nonroad Engines, Vehicles, and Equipment; EPA ICR Number 2583.01, OMB Control Number 2060--NEW
- September 2, 2016: Alternative Method for Calculating Off-cycle Credits Under the Light-Duty Vehicle Greenhouse Gas Emissions Program: Applications From BMW Group, Ford Motor Company, General Motors Corporation, and Volkswagen Group of America
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.