A bill to amend the Clear Air Act to provide for more effective motor vehicles emission controls at high altitudes.

[AI summary unavailable — showing source text] Provides, under the Clean Air Act, that specified vehicles and engines sold to ultimate purchasers shall comply with specified emission standards for altitudes up to 7,000 feet above sea level. States that this Act shall apply to motor vehicles manufactured during the model year 1976 and thereafter. Directs that, upon request of the Governor of a State, the Administrator of the Enviromental Protection Agency shall prescribe, or shall authorize an agency of such State to prescribe, regulations authorizing specific modifications by the manufacturer or dealer of any motor vehicle emission control system if, in the Administrator's determination, such modifications are within reasonable cost limits are necessary to assure that such system functions in compliance with the provisions of the Clean Air Act under normal driving conditions in such State, including high altitude conditions. Provides that, under regulations prescribed by the Administrator, the manufacturer of any motor vehicle or engine manufactured after model year 1969 shall provide to the dealer, upon the dealer's request, such equipment and technical assistance as may be needed to modify any device or element of design for …