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On November 16, the Arizona Department of Environmental Quality (ADEQ) denounced the U.S. Environmental Protection Agency's (EPA) decision to impose air pollution control requirements, more strict than those proposed by the ADEQ, at several large power facilities which would require the installation of more than $500 million in air pollution controls. These facilities include APS Cholla Power Plant near Joseph City, the SRP Coronado Generation Station near St. Johns, and the AEPCO Apache Generating Station near Benson. While the action is part of the Regional Haze Program, the ADEQ does not feel the additional controls would result in any perceptible improvements in visibility.

Additionally, in October 2012, the ADEQ submitted a notice of intent to sue the EPA for failing to act timely on the full review of its regional haze plan. Initially submitted in 2003 and 2004, with a supplemental submittal in 2011, the EPA was required to review the ADEQ's plan by August 28, 2012. However, on July 2, 2012, with an approved settlement by the DC Circuit Court, the EPA was allowed to split its review of the ADEQ's regional haze plan into multiple parts and extend its deadline to act. The ADEQ has appealed the DC Circuit Court's approval of the settlement.