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Utah 's state implementation plan for visibility
(20.3 kb)was first drafted in 1984 and was approved by EPA. The most recent amendments to the SIP were approved by EPA in 1997. The plan addresses specific categories of stationary sources built between 1962 and 1977 (40 CFR 51.300 - 51.307) that may contribute to visibility impairment in mandatory Federal Class I areas (listed in 40 CFR 81.403). This form of visibility impairment by a single source or several adjacent sources near a protected Class I area is often referred to as "plume blight." Addressing the objective of the visibility goal for mandatory Federal Class I areas as described in section 169 of the Clean Air Act, the SIP includes a rule regarding how the state will determine the appropriate level of control technology to be applied to a source found attributable.
The visibility SIP built on the work of the Citizen's Advisory Committee on Visibility, appointed by Governor Norman Bangerter in 1985. The Advisory Committee, made up of representatives of industry, local government, environmental groups, agriculture and the public, recommended protection of visibility and noted that the greatest threat to visibility is regional haze, not plume blight. As a result of their report, the state requested in 1987 that the Western Governors' Association establish a task force on regional haze.