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
- July 18, 2016: Draft Technical Assessment Report (TAR) and 60-day Public Comment Period.
- June 2, 2016: SmartWay webinar: Freight Matters! The Power of Partnerships will take place on Wednesday, June 22, 2016, 2:00 PM - 3:00 PM (ET).
OTAQ Press Releases
- July 18, 2016: US EPA, US DOT, California’s Air Resources Board Issue Draft Technical Assessment Report of Greenhouse Gas Emissions and Fuel Economy Standards for Model Year 2022-2025 Cars and Light Trucks
- June 28, 2016: Volkswagen to Spend Up to $14.7 Billion to Settle Allegations of Cheating Emissions Tests and Deceiving Customers on 2.0 Liter Diesel Vehicles
- June 28 2016: TODAY: EPA, DOJ, FTC to Hold Press Conference to Announce Significant Environmental and Consumer Relief in Volkswagen Litigation
OTAQ Federal Register Notices
- May 31, 2016: Intent To Disclose Confidential Business Information Contained in Vehicle Sales Data for Model Years 2009-2014 to the U.S. Energy Information Administration for Use in Modeling and Projecting Energy Demand in the Light-Duty Vehicle Sector
- May 31, 2016: Renewable Fuel Standard Program: Standards for 2017 and Biomass-Based Diesel Volume for 2018
- May 25, 2016: Public Hearing for Standards for 2017 and Biomass-Based Diesel Volume for 2018 Under the Renewable Fuel Standard Program
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.