42 U.S. Code § 7549 - High altitude performance adjustments
No instructions under this section respecting adjustments or modifications may require the use of any manufacturer parts (as defined in section 7522(a) of this title) unless the manufacturer demonstrates to the satisfaction of the Administrator that the use of such manufacturer parts is necessary to insure emission control performance.
Before January 1, 1981 the authority provided by this section shall be available in any high altitude State (as determined under regulations of the Administrator under regulations promulgated before August 7, 1977) but after December 31, 1980, such authority shall be available only in any such State in which an inspection and maintenance program for the testing of motor vehicle emissions has been instituted for the portions of the State where any national ambient air quality standard for auto-related pollutants has not been attained.
In subsec. (d), “August 7, 1977” substituted for “the date of enactment of this Act” to reflect the probable intent of Congress that such date of enactment meant the date of enactment of Pub. L. 95–95.
1990—Subsec. (e). Pub. L. 101–549 added subsec. (e).
1977—Subsec. (d). Pub. L. 95–190 substituted “December 31, 1980” for “December 31, 1981”.
“Federal Transit Administration” substituted for “Urban Mass Transportation Administration” in subsec. (e)(2) pursuant to section 3004(b) of Pub. L. 102–240, set out as a note under section 107 of Title 49, Transportation.