Air Plan Revisions; Arizona; Maricopa County Air Quality Department; New Source Review; Emission Reduction Credits

The Environmental Protection Agency (EPA) is proposing to approve a revision to the Maricopa County Air Quality Department’s (MCAQD or “Department”) portion of the Arizona State Implementation Plan (SIP). This revision establishes a federally enforceable program allowing fleet owners/operators to generate emission reduction credits (ERCs) by either retrofitting or replacing existing fleet vehicles with lower emitting vehicles while meeting other ongoing requirements. These ERCs are intended for use as offsets under the Department’s nonattainment New Source Review (NNSR) program. We are taking comments on this proposal and plan to follow with a final action.