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Vehicles and Engines

National Information

Cars and Light Trucks

In the past thirty years emissions from gasoline-powered automobiles have been reduced dramatically. Beginning in the 1970s, catalytic converters were added and unleaded gasoline became standard. The 1980s saw the introduction of computer controls, and the 1990s brought the advent of sophisticated On-Board Diagnostic (OBD) systems and evaporative emission controls. Throughout that time fuel economy has improved, and now automobiles are emitting, on average, 95% less harmful pollutants per mile than in 1970.


Diesel Vehicles and Engines

EPA Region 4 supports a number of programs aimed at reducing emissions from heavy-duty diesel (HDD) engines. Heavy-duty diesel engines are significant sources of ozone-forming pollutants such as nitrogen oxides (NOx) and hydrocarbons (HC), as well as particulate matter (PM). Although diesel vehicles account for only a small percentage of the vehicles on the road, they make a large contribution to the overall amount of mobile source emissions. The Southeast Diesel Collaborative (SEDC) is a partnership of leaders from federal, state and local government, the private sector and other stakeholders in Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina and Tennessee. The goal of this partnership is to improve air quality and public health by reducing emissions from existing diesel engines.


Fuel Cell Vehicles

EPA is taking a leading role in the development of fuel cell technology for automotive applications. You can learn more at the Office of Transportation and Air Quality (OTAQ) fuel cell Web site.



For information on the contents of this page contact Amanetta Somerville.

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