State what role the EPA has had in federal programs and what was accomplished. B. Explain to the students what happens when a car burns gasoline or diesel fuel. Some of the fuel is changed into energy to move the vehicle. By-products of the process include heat and air pollutants which exit through the exhaust system. C. Use the background information to discuss with students the pollutants that are emitted from exhaust.
Cars using unleaded gasoline and diesel fuels are the most common.
You might be able to find vehicles using leaded gasoline or alternative fuels such as alcohol or methane. Old and new vehicles can provide variation. You may be able to make arrangements to have a school bus available for the experiment. The experiment should never be conducted in a closed building. Emergency brake should be set on each vehicle.