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The Arizona Department of Environmental Quality (ADEQ) submitted multiple revisions to the Arizona State Implementation Plan (SIP) from 1998 to 2012. Supplemental submittals were also made in 2013 and 2014. USEPA is approving these SIP revisions in a direct final action (without prior notice and comment); these revisions will become effective on November 24, 2014 unless USEPA receives adverse comments by October 23, 2014. The revisions include two State statutes, certain State rules that govern stationary sources and that establish definitions and other general provisions, ambient air quality standards and area designations, and emissions limitations and other requirements for certain types of stationary sources.

ADEQ submitted the statutes and rules to update the SIP and to delete rules that have been repealed or are otherwise unnecessary to retain in the SIP because the sources to which the requirements had applied no longer exist. The statutes and rule revisions generally renumber and update statutes and rules approved previously in the SIP. They also do not relax any existing emissions limits or standards and meet all applicable requirements.

More information on this rule and how to submit comments can be found here.