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The Code of Federal Regulations (CFR) annual edition is the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government produced by the Office of the Federal Register (OFR) and the Government Publishing Office.


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Electronic Code of Federal Regulations

e-CFR data is current as of April 16, 2015

Title 40Chapter ISubchapter CPart 51Subpart Z → §51.1006


Title 40: Protection of Environment
PART 51—REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS
Subpart Z—Provisions for Implementation of PM2.5 National Ambient Air Quality Standards


§51.1006   Redesignation to nonattainment following initial designations for the PM2.5 NAAQS.

Any area that is initially designated “attainment/unclassifiable” for the PM2.5 NAAQS may be subsequently redesignated to nonattainment if ambient air quality data in future years indicate that such a redesignation is appropriate. For any such area that is redesignated to nonattainment for the PM2.5 NAAQS, any absolute, fixed date that is applicable in connection with the requirements of this part is extended by a period of time equal to the length of time between the effective date of the initial designation for the PM2.5 NAAQS and the effective date of redesignation, except as otherwise provided in this subpart.


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