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Electronic Code of Federal Regulations

e-CFR data is current as of December 5, 2019

Title 40Chapter ISubchapter CPart 51Subpart X → §51.919


Title 40: Protection of Environment
PART 51—REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS
Subpart X—Provisions for Implementation of 8-hour Ozone National Ambient Air Quality Standard


§51.919   Applicability.

As of April 6, 2015, the provisions of subpart AA shall replace the provisions of subpart X, §§51.900 to 51.918, which will cease to apply, with the exception of the attainment date extension provisions of §51.907 for the anti-backsliding purposes of §51.1105(d)(2).

[80 FR 12312, Mar. 6, 2015]

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