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Particulate Matter 10 (PM10)
PM10 State Implementation Plan
PM10 SIP for Utah and Salt Lake County
On November 14, 1991, Utah submitted a SIP for the Salt Lake and Utah County nonattainment areas. The SIP demonstrated attainment of the PM10 standard for 10 years, 1993 through 2003. EPA published approval of the SIP on July 8, 1994 (59 FR 35036), and Utah achieved attainment of the standard in both areas by 1996. The control measures adopted as part of those plans have proven successful. Both the Salt Lake and the Utah County areas continue to show compliance with the federal health standards for PM10.
PM10 SIP for Ogden City
Ogden City was redesignated to nonattainment from unclassifiable on September 26, 1995. This redesignation triggered the requirement that the state develop a nonattainment SIP with an attainment date of December 31, 2001.
In 1997 a new standard for PM10 was promulgated by the EPA. Based on the revised form of the standard, Ogden City would have never been out of compliance. However, a 1999 ruling by the D.C. Circuit vacated the new 1997 standard. In response to the D.C. Circuit ruling, the EPA gave areas like Ogden City another avenue to satisfy its Part D attainment requirements found under Title I of the Clean Air Act. This avenue for attainment was provided in the form of EPA’s Clean Data Policy found in 40 C.F.R. 51.004(c). This policy allowed EPA to make a determination of attainment regarding a specific area. Utah submitted a letter in 2000 that requested that the EPA make a determination under the policy. In 2013, the EPA determined that the Ogden City nonattainment area was currently attaining the 24-hour standard for PM10.
PM10 State Maintenance Plan
PM10 Maintenance Plan for Utah and Salt Lake County
On December 2nd, 2015, the Air Quality Board adopted revisions to the SIP in the form of maintenance plans for the Salt Lake and Utah County nonattainment areas. These plans demonstrate attainment through the year 2030. The plans have been submitted to EPA, and the state is currently awaiting their approval. An EPA approved maintenance plan will allow the EPA to redesignate the area as an attainment area. The development of these plans also signifies the state’s intentions to move on from PM10 and focus on PM2.5 in the future.
PM10 Maintenance Plan for Ogden City
The Air Quality Board also adopted a maintenance plan for Ogden City demonstrating attainment through the year 2030. Like the Utah and Salt Lake County plans, the Ogden City plan also requests that the nonattainment area status be redesignated as attainment. The plan has also been submitted to the EPA and is awaiting EPA’s approval. All three of the PM10 Maintenance Plans are currently enforceable at the state level.