PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2415 area fails to make reasonable further progress, or to attain the national primary ambient air quality standard by the attainment date applicable under this part. Such measures shall be included in the plan revision as contingency measures to take effect in any such case without further action by the State or the Administrator. "(d) PLAN REVISIONS REQUIRED IN RESPONSE TO FINDING OF PLAN INADEQUACY.— Any plan revision for a nonattainment area which is required to be submitted in response to a finding by the Administrator pursuant to section 110(k)(5) (relating to calls for plan revisions) must correct the plan deficiency (or deficiencies) specified by the Administrator and meet all other applicable plan requirements of section 110 and this part. The Administrator may reasonably adjust the dates otherwise applicable under such requirements to such revision (except for attainment dates that have not yet elapsed), to the extent necessary to achieve a consistent application of such requirements. In order to facilitate submittal by the States of adequate and approvable plans consistent with the applicable requirements of this Act, the Administrator shall, as appropriate and from time to time, issue written guidelines, interpretations, and information to the States which shall be available to the public, taking into consideration any such guidelines, interpretations, or information provided before the date of the enactment of the Clean Air Act Amendments of 1990. "(e) FUTURE MODIFICATION OF STANDARD. — If the Administrator relaxes a national primary ambient air quality standard after the date of the enactment of the Clean Air Act Amendments of 1990, the Administrator shall, within 12 months after the relaxation, promulgate requirements applicable to all areas which have not attained that standard as of the date of such relaxation. Such requirements shall provide for controls which are not less stringent than the controls applicable to areas designated nonattainment before such relaxation.'. (c) NEW SOURCE PERMIT REQUIREMENTS.— Section 173 of the Clean Air Act (42 U.S.C. 7503) is amended as follows: (1) Strike the center heading and "SEC. 173." and insert: "SEC. 173. PERMIT REQUIREMENTS.". (2) Insert "(a) IN GENERAL. —" before the first sentence. (3) Insert the following after "(1)": "in accordance with regulations issued by the Administrator for the determination of baseline emissions in a manner consistent with the assumptions underlying the applicable implementation plan approved under section 110 and this part,". (4) Make the following amendments in subparagraph (A) of paragraph (1): (A) Insert "sufficient offsetting emissions reductions have been obtained, such that" immediately after the comma following "commence operation". (B) Strike "allowed under the applicable implementation plan" and insert "(as determined in accordance with the regulations under this paragraph)". (5) Make the following amendments in subparagraph (B) of paragraph (1): (A) Insert "in the case of a new or modified major stationary source which is located in a zone (within the nonattainment area) identified by the Administrator, in consultation Intergovernmental relations. Public information.
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