§ 51.464 - Special provisions for nonattainment areas which are not required to demonstrate reasonable further progress and attainment.

(a) Application. This section applies in the following areas:

(1) Rural transport ozone nonattainment areas;

(2) Marginal ozone areas;

(3) Submarginal ozone areas;

(4) Transitional ozone areas;

(5) Incomplete data ozone areas;

(6) Moderate CO areas with a design value of 12.7 ppm or less; and

(7) Not classified CO areas.

(b) Default conformity procedures. The criteria and procedures in §§ 51.436 through 51.440 will remain in effect throughout the control strategy period for transportation plans, TIPs, and projects (not from a conforming plan and TIP) in lieu of the procedures in §§ 51.428 through 51.432, except as otherwise provided in paragraph (c) of this section.

(c) Optional conformity procedures. The State or MPO may voluntarily develop an attainment demonstration and corresponding motor vehicle emissions budget like those required in areas with higher nonattainment classifications. In this case, the State must submit an implementation plan revision which contains that budget and attainment demonstration. Once EPA has approved this implementation plan revision, the procedures in §§ 51.428 through 51.432 apply in lieu of the procedures in §§ 51.436 through 51.440