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
- May 20: SmartWay has released a Best Practices Guide for its Affiliate partners.
- May 19: SmartWay announces the release of its 2015 SmartWay Multimodal Carrier Tool, which utilizes multimodal freight carriers' data from the 2014 calendar year to allow them to assess their environmental performance. This tool lets multimodal carriers calculate their companies' annual CO2, NOx, and PM emissions and track annual changes in performance.
- May 14: OTAQ “Contacts by Topic” list updated.
OTAQ Press Releases
- May 18, 2015: EPA Announces $1 Million for Tribal Applicants to Upgrade Diesel Engines EPA seeks to reduce emissions from older engines impacting tribal communities
- May 15, 2015: EPA announces availability of $1 million for tribes to upgrade diesel engines
- May 6, 2015: EPA Announces Availability of Clean Diesel Grants for Communities Across the Country/Local governments, tribal agencies and nonprofits can win grants up to $2.14 million
OTAQ Federal Register Notices
- May 15, 2015: Proposed Information Collection Request; Comment Request; Data Reporting Requirements for State and Local Vehicle Emission Inspection and Maintenance (I/M) Programs
- May 8, 2015: Partial Withdrawal of Technical Amendments Related to: Tier 3 Motor Vehicle Fuel and Quality Assurance Plan Provisions
- May 7, 2015: California State Nonroad Engine Pollution Control Standards; Mobile Cargo Handling Equipment at Ports and Intermodal Rail Yards Regulations
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.