Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Air Actions, Arizona
Sulfur Dioxide in Douglas, Arizona
December 27, 2005: Approval of Arizona's Plan to Meet the Sulfur Dioxide Air Quality Standards in the Douglas Area
EPA has signed a direct final rule approving Arizona's plan to maintain attainment of the short-term (24-hour) and long-term (annual) primary National Ambient Air Quality Standards (NAAQS) for sulfur dioxide (SO2) in the Douglas area, as well as Arizona’s request to redesignate this area from nonattainment to attainment for SO2.
The Douglas area has not had a violation of either the annual or the 24-hour health-based standard since 1987. The primary source of sulfur dioxide pollution in the Douglas area was the Phelps Dodge Douglas Reduction Works smelter, which ceased operation in 1987 and was dismantled by 1991. There are currently no other SO2 sources of this magnitude in Douglas.
Federal Register Notice (February 28, 2006)
Office of Air Planning
EPA Region 9
Phone: (520) 622-1622
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