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 12: EPA releases annual Fuel Economy Trends Report.
- December 11: EPA announces grant funding to improve air quality at marine and inland water ports.
- December 3: EPA and DOE release annual Fuel Economy Guide with 2014 models.
OTAQ Press Releases
- December 12, 2013: Fuel Economy of New Vehicles Sets Record High / Fuel Economy Gains to Continue Under President Obama's Clean Car Programs
- December 11, 2013: EPA Program Seeks to Improve Air Quality in Port Communities / $4 Million Grant Program to Clean Older Diesel Engines at Ports
- December 3, 2013: EPA and DOE Release Annual Fuel Economy Guide with 2014 Models
OTAQ Federal Register Notices
- December 11, 2013: Approval and Promulgation of Implementation Plans; State of California; 2012 Los Angeles County State Implementation Plan for 2008 Lead Standard
- December 9, 2013: Approval and Promulgation of Air Quality Implementation Plans; West Virginia; Approval of the Redesignation Requests of the West Virginia Portion of the Steubenville-Weirton, OH-WV Nonattainment Area for the 1997 and 2006 Fine Particulate Matter Standards
- December 5, 2013: Adequacy Status of Motor Vehicle Emissions Budget in Submitted State Implementation Plan; Maricopa County PM-10 Nonattainment Area, Arizona
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.