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Oxygenated Fuels

 Gasoline blended with alcohol or ether containing oxygen. Use of such fuels reduces carbon monoxide production and other emissions.

NOx

The sum of nitric oxide, and nitrogen dioxide. The primary nitrogen pollutant emitted for the combustion process.

Model

A mathematical and geometric projection of activity and the interactions in the transportation system in an area. This projection must be able to be evaluated according to a given set of criteria which might include land use, economics, social values, and travel...