1969-02-01

Present and Future Emission Standards for Heavy-Duty Vehicles 690765

From the initial motor vehicle emission standards that pertained only to exhaust of hydrocarbons and carbon monoxide, the California laws have gradually expanded control of all types of pollution from automobiles. Whereas pioneer legislation applied to all types of vehicles, significant changes in the laws now set up separate standards for light and heavy duty vehicles and for engines using gasoline and diesel fuels. This paper reviews the history and status of present California and federal emissions standards for heavy duty vehicles and discusses possible future development in this particular vehicle class.

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