51.1011—Requirements for mid-course review.
(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.
(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;
(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.