To amend the Clean Air Act to extend the deadline for the imposition of sanctions under section 179 of the Act.

Amends the Clean Air Act to extend from 18 to 30 months the deadline for States to correct deficiencies or failures to submit implementation plans, make other specified submissions, or implement plan provisions with respect to nonattainment areas before sanctions are imposed.

Makes this Act effective with respect to findings, disapprovals, or determinations made after 18 months prior to this Act's enactment date.