(a) Any State that submits to EPA an approvable attainment plan for a PM2.5 nonattainment area justifying an attainment date of nine or ten years from the date of designation also must submit to EPA a mid-course review six years from the date of designation.
(b) The mid-course review for an area must include:
(1) A review of emissions reductions and progress made in implementing control measures to reduce emissions of direct PM2.5 and PM2.5 attainment plan precursors contributing to PM2.5 concentrations in the area;
(2) An analysis of changes in ambient air quality data for the area;
(3) Revised air quality modeling analysis to demonstrate attainment;
(4) Any new or revised control measures adopted by the State, as necessary to ensure attainment by the attainment date in the approved SIP of the nonattainment area.