(a) Upon the effective date of reclassification, the requirements of any subpart of this part with respect to ozone nonattainment planning applicable to the area for the former classification shall apply as follows:

(1) Unless specified in paragraph (a)(2) or (3) of this section, the requirement is unaffected by reclassification and continues to be required for the former classification.

(2) The following requirements are no longer applicable with respect to the former attainment date:

(i) A SIP revision to demonstrate attainment by such date.

(ii) A SIP revision demonstrating adoption of all RACM necessary to demonstrate attainment with respect to such date.

(3) If the reclassification became effective prior to the former attainment date pursuant to CAA section 181(b)(3), the plan requirement for contingency measures for failure to attain by such date is no longer applicable with respect to the former attainment date.

(b) Nothing in this section shall affect the requirements applicable to the nonattainment area under its currently applicable classification and attainment date.