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
- February 1, 2016: SmartWay webinar: 2016 SmartWay Excellence Award will take place on Wednesday, February 17, 2016, 2:00 PM - 3:00 PM (EST).
- January 27, 2016: SmartWay webinar Truck Tool -- Advanced Class: Getting the Most out of Your SmartWay Participation will take place on Wednesday, February 10, 2016, 2:00 PM - 3:00 PM (EST).
- January 27, 2016: Smartway announces the 2016 Award Criteria.
OTAQ Press Releases
- January 4, 2016: United States Files Complaint Against Volkswagen, Audi and Porsche for Alleged Clean Air Act Violations
- December 16, 2015: EPA Reports: Automakers Beat Greenhouse Gas Emissions Standards for Third Straight Year Fuel economy steady at highest level ever recorded
- December 16, 2015: EPA Reports: Automakers Beat Greenhouse Gas Emissions Standards for Third Straight Year - Fuel economy steady at highest level ever recorded
OTAQ Federal Register Notices
- December 21, 2015: Access by EPA Contractors to Information Claimed as Confidential Business Information (CBI) Submitted under Title II of the Clean Air Act and Related Regulations
- December 14, 2015: Renewable Fuel Standard Program: Standards for 2014, 2015, and 2016 and Biomass-Based Diesel Volume for 2017
- December 11, 2015: California State Nonroad Engine Pollution Control Standards; Small Off-Road Engines Regulations; Tier 4 Off-Road Compression- Ignition Regulations; Exhaust Emission Certification Test Fuel for Off- Road Spark-Ignition Engines, Equipment, and Vehicles 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.