Northern Wasatch Front Ozone Emissions Inventory

In August 2018, the EPA designated sections of the Wasatch Front as a nonattainment area for ozone based on the 2015 National Ambient Air Quality Standard of 70 ppb. The area includes Salt Lake, Davis, as well as portions of Weber and Tooele counties. Since the Northern Wasatch Front failed to meet the 70 ppb threshold by August 2021, the area was bumped up to “Moderate” nonattainment status. As part of this designation, Utah was required to develop and submit a moderate State Implementation Plan (SIP), which included a description of how the state reduced emissions in order to meet the air quality standard.

However, as the area failed to attain the standard by the moderate attainment date of August, 2024, the area will be further redesignated as a Serious nonattainment area. As a result of this more stringent designation, the state will again need to develop a SIP amendment showing how the state will further reduce NOx and VOC emissions throughout the nonattainment area.

• Explore the boundaries of our nonattainment areas

As part of the SIP process, the State of Utah has developed inventories of emissions for both NOx and VOCs in the Wasatch Front which can be used to explore and identify various emission sources. Rules can then be adopted to help reduce emissions from these sources, which would count towards reductions in pollutants required for the SIP.

Many sources of pollution are already regulated through past SIPs and other rulemaking efforts.

Use this chart to explore different levels of emissions controls and reductions applied to area sources. Note that this chart only applies to area sources; nonroad mobile, onroad mobile, and point sources are not displayed and only to VOC emissions. Similar rules exist to reduce NOx emissions but are not included in this chart.

• Potential to Be Controlled: These emissions sources are not yet subject to emissions control measures or have the potential to be further controlled.
• No Further Action: These emissions sources are already subject to the best available control measures or other emissions reduction rulemaking. No further action can be taken to reduce even more emissions.
• No Feasible Controls Known: These emissions sources are either technologically impossible to control, or they are economically infeasible to control.