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Smog Standard May|Change for Biofuel Cars

WASHINGTON (CN) - The Environmental Protection Agency is reviewing whether tailpipe emission-reduction rules for light-duty vehicles should be changed to minimize adverse economic impacts on small entities.

The rule would primarily affect companies that convert gasoline vehicles to operate on alternative fuel, and several that import vehicles into the U.S. and upgrade their emission control systems to EPA specifications.

With the tailpipe rules, the EPA sought to reduce emissions of nitrogen oxides and non-methane hydrocarbons, pollutants which contribute to ozone pollution.

The rules also required oil refiners to limit the sulfur content of the gasoline they produce. The EPA states that, sulfur in gasoline has a detrimental impact on catalyst performance and the sulfur requirements have enabled the introduction of advanced technology emission control systems on motor vehicles.

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