NO X exemption provisions.

(a) A person or a state may petition the Administrator for an exemption from NO X obligations under CAA section 182(f) for any area designated nonattainment for a specific ozone NAAQS and for any area in a CAA section 184 ozone transport region. (b) The petition must contain adequate documentation that the criteria in CAA section 182(f) are met. (c) A CAA section 182(f) NO X exemption granted for a prior ozone NAAQS does not relieve the area from any NO X obligations under CAA section 182(f) for a current ozone NAAQS. [83 FR 63033, Dec. 6, 2018]