A bill to establish and support State inspection programs for auto emission control systems.

Provides that after January 1, 1975, the Secretary of Transportation shall not approve a State highway safety program unless he determines that the State has established a program, certified as adequate by the Administrator of the Environmental Protection Agency, to inspect the auto emission control systems of motor vehicles which have been sold in accordance with certifications granted under the provisions of the Clean Air Act.

Provides that funds authorized be appropriated to carry out this Act shall be used to aid the States in establishing and operating emission control system inspection centers and shall be available to pay up to 75 percent of the cost to the State of establishing and maintaining such centers.

Authorizes to be appropriated to the Secretary of Transportation for the implementation of this Act, out of the Highway Trust Fund, $300,000,000 for fiscal year 1974, and $400,000,000 for fiscal year 1975.