((a)) ** In general** Nothing in this Act or the amendments made by this Act shall be construed to alter, affect, or modify the provisions of the Clean Air Act [ et seq.], or regulations issued thereunder.42 U.S.C. 7401

((b)) ** Compliance by alternative fueled vehicles** Alternative fueled vehicles, whether dedicated vehicles or dual fueled vehicles, and the alternative fuels for operating such vehicles, shall comply with requirements of the Clean Air Act [ et seq.] applicable to such vehicles and fuels.42 U.S.C. 7401