After almost two years of development of the Salt Lake Area PM2.5 Serious Non-Attainment State Implementation Plan (SIP), the Utah Air Quality Board (AQB) approved the Utah Division of Air Quality's (UDAQ) proposal for Part S of the plan. This approval occurred during the January 2, 2019 Utah AQB meeting, following a second public comment period from November 1 through November 30, 2018, for the PM2.5 Serious Non-attainment SIP.

The SIP demonstrates through a "weight of evidence" (not modeling) that the Salt Lake nonattainment area will achieve attainment for PM2.5 and its precursors (NOx, SO2, VOCs, and NH3) by December 31, 2019.

The Utah AQB also decided on its proposed changes to the Part H conditions for Major Sources listed in the PM2.5 Serious Non-attainment SIP. These changes included but were not limited to the following:

  • Proposal for annual stack testing in place of three years for all major SIP listed sources;
  • Flare flow requirements at refineries;
  • Revising Best Available Control Technology/ Best Available Control Measures relative to fuel usage on select sources; and
  • Consideration of seasonal limits.

The AQB decided that four (4) sources required annual stack testing. Additionally, an outstanding issue remains with the consideration of the use of coal versus natural gas for BACT, even though the usage of fuel was not defined in the BACT request. Although one outstanding issue remains, the Utah AQB and UDAQ have agreed upon a PM2.5 Serious Non-attainment SIP which will be presented to U.S. EPA.