The requirements for nonattainment NSR for the ozone NAAQS are located in Sec. 51.165. For each nonattainment area, the state shall submit a nonattainment NSR plan or plan revision for the 2008 ozone NAAQS no later than 36 months after the effective date of the area's designation for the 2008 ozone NAAQS. [80 FR 12314, Mar. 6, 2015]