New Source Review - Ammonia | Proposed Air Quality Rulemaking

ADEQ welcomes comments on the proposed rulemaking for the addition of a significant emission rate for ammonia, as a precursor in the formation of secondary fine particulate matter (PM2.5), in PM2.5 nonattainment areas in the State. 

Summary:

ADEQ is proposing a definition of "significant" that varies from the Notice of Proposed Rulemaking (NPRM).  The definition of "significant" in the NPRM would have required minor sources of ammonia in PM2.5 nonattainment areas to obtain a Class II permit.  The definition of significant in the Notice of Supplemental Proposed Rulemaking clarifies the rule language so that only major sources of ammonia in PM2.5 nonattainment areas will be required to obtain a permit.

Additionally, based on public comments received during the NPRM’s comment period, ADEQ is proposing to update incorporations by reference of 40 C.F.R. Part 51, Appendix W (“Appendix W”), which governs modeling, to incorporate the most current version.  Additional technical corrections are being proposed to existing Articles 3 and 4 to improve clarity and consistency.

The rule amendment will be submitted to the U.S. Environmental Protection Agency as a revision the Arizona State Implementation Plan pursuant to Clean Air Act § 110 (42 U.S.C. § 7410).

Documents:

  • Current Rules | View >
  • Notice of Docket Opening | View >
  • Notice of Proposed Rulemaking | View >
  • Arizona State Implementation Plan Revision: Determination of a Significant Emission Rate for Ammonia | View >
  • Notice of Supplemental Proposed Rulemaking | Go to Secretary of State's Page >
  • SIP Revision: New Source Review -- Significant Emission Rate for Ammonia in PM2.5 Nonattainment Areas | View >