A bill to amend section 202 of the Clean Air Act with respect to motor vehicle emission standards.

Provides, under the Clean Air Act, that the Administrator of the Environmental Protection Agency shall prescribe standards applicable to the emission of any air pollutant from any class of new motor vehicles or new engines, which in his judgment contributes to, or is likely to contribute to, air pollution which endangers the public health or welfare.

States that such regulations applicable to emissions of carbon monoxide and hydrocarbons from light duty vehicles and engines manufactured during or after model year 1975 shall contain standards which were established for the 1974 model year. Requires the Administrator to report annually to the Congress with respect to the development of systems necessary to implement the emission standards established pursuant to this Act. implement the emission standards established pursuant to this Act. Specifies the content of such reports.

Provides that any manufacturer may file with the Administrator an application requesting the suspension, for one year only, of the effective date of any emission standard. Prescribes the procedures for granting or denial of such suspension.

Directs the Administrator to undertake arrangements with the National Academy of Sciences and other concerned Government agencies to conduct a study of the entire vehicle emission problem. Directs the Academy to submit semiannual progress reports. Requires the Administrator, upon review of such reports, to recommend congressional action necessary to insure implementation of the optimal engine-fuel-hardware strategy for emission control.