Transportation and Fuels – Environmental Knowledgebase

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Frequent Questions

How can I find out if the replacement of a part of my vehicle is covered under an emissions warranty?
How can I improve my gas mileage?
How do I find more information on emissions for my motorcycle?
I just bought a used car and discovered the catalytic converter is missing. Is that legal?
What do I need to do if I want to import a car or have a personal vehicle shipped back to the United States?
What factors influence the price of gas?
What is EPA doing about diesel idling? Where can I find out information about diesel idling regulations?
What is in the contrails that jets leave in the sky?
Where can I find information about the diesel fuel used in heavy-duty trucks and buses and the emissions from diesel vehicles?
Where can I find information on aircraft and the environment?
Where can I find information on EPA approved gas cans or fuel containers?
Where can I find information on the Tier 2 vehicle and gasoline sulfur standards?
Where can I find the requirements for secondary containment of a mobile fuel tank on a construction site?
Where can I get information about alternative fuels or alternative fuel vehicles?
Where can I learn about auto emissions and how they may affect the atmosphere?
Where on the EPA Web site is there general information about automobiles, fuels, engines, vehicle emissions, and other transportation issues and regulations?