The Utah Division of Air Quality (UDAQ) is progressing with the development of the Provo, Salt Lake, and Logan PM2.5 Serious Non-attainment State Implementation Plans (SIPs). In December 2017, UDAQ decided to split the Provo and Salt Lake Non-attainment Area SIPs. The Logan Non-attainment Area will remain on track as long as U.S. Environmental Protection Agency (EPA) does not reclassify the area.

The status of the modeling, emission inventories, and best available control technology (BACT) analyses relative to the PM2.5 Serious Non-attainment SIPs are as follows:

Salt Lake Nonattainment Area

  • Modeling: The model showed more reductions in emissions from the vehicle emission program, but those results demonstrated exceedance of the standard at Rose Park and Hawthorne in 2024.
  • Emission Inventories and BACT: Draft emissions inventories for different years are being evaluated on a case-by case basis that could potentially be utilized in the SIP. Work is still being done on BACT analyses for stationary sources.

Provo Nonattainment Area

  • Modeling: If EPA approves UDAQ's proposed design value, the SIP modeling showed values below the standard by 2019.
  • Emission Inventories and BACT: There are only two stationary sources in the Provo Non-attainment Area and the BACT work is almost complete on those sources, which means the projection emissions inventory can be completed.

UDAQ has indicated its plans are to complete the Provo PM2.5 Serious Non-attainment SIP documents in the first quarter and work will continue on the Salt Lake Non-attainment Area. Updates to the PM2.5 Serious Non-attainment SIP progress will be provided in the March 7, 2018 Air Quality Board (AQB) meeting.