Air Monitoring Locations
Utah Division of Air Quality. (n.d.). Utah Air Monitoring Program. [Dataset]. Utah Department of Environmental Quality. https://air.utah.gov/dataarchive/archall.htm
The Department of Environmental Quality carefully monitors air quality around the state using strategically placed monitors. In 2024 the state invested in 4 new monitors and expanded 4 to capture new particulate matter metrics around Great Salt Lake. Currently there are 26 monitors statewide, a majority of which are clustered around the Great Salt Lake to enable scientists to better understand dust composition and monitor storm events. Monitoring stations are labeled by name on this map. You can view a legend by clicking on the “i” in the top left corner.
Air Quality Index (AQI) Reports
US Environmental Protection Agency. (2025). Air Quality Index Daily Values Report. (# Days Unhealthy, # Days Very Unhealthy, # Days Hazardous). [Data set]. AirNow. https://www.epa.gov/outdoor-air-quality-data/air-quality-index-daily-values-report
The Air Quality Index (AQI) is a national tool from the Environmental Protection Agency used to communicate outdoor air quality as it relates to human health. Calculated using the average pollutant concentration over 24 hours compared with federal standards. When Air Quality Index values surpass 100, it is generally considered unsafe for sensitive groups. Measuring the number of “bad air days” exceeding an Air Quality Index of 100 is a common strategy for understanding the air quality of an area. Shown here are the number of days exceeding an AQI of 100 in each county monitored.
This table compiles data from the Environmental Protection Agency counting the number of days with an Air Quality Index over 100 in each county. You can use the filters to view the data by county, year, or by the number of days AQI exceeds 100.
Current Air Quality Index
AirNow. (2025). Current Monitor Data Public (FeatureServer) [Data set]. U.S. Environmental Protection Agency. https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/Air%20Now%20Current%20Monitor%20Data%20Public/FeatureServer
This map displays AQI monitoring sites across the nation. Standard colors are used to indicate current measurements relevant to Ozone and Particulate Matter along with the most recently reported Air Quality Index Value. The Environmental Protection Agency maintains this dataset along with Air Quality Index reports.
Utah Air Monitoring Program
U.S. Environmental Protection Agency. (2025, December 16). NAAQS table. https://www.epa.gov/criteria-air-pollutants/naaqs-table
Utah Division of Air Quality. (2025). Utah Air Monitoring Program. (All Criteria Pollutant Yearly Quicklook Summary Reports). [Data set]. Utah Department of Environmental Quality. https://air.utah.gov/dataarchive/archall.htm
Made using data from the Utah Air Monitoring Program data archive, these tables report relevant pollutant measures as well as design values from each monitoring site. Design values (DV) are used by the Environmental Protection Agency to designate non-attainment areas and track progress towards the National Ambient Air Quality Standards. Calculated using a three-year average of various pollutant measures, these design values are compared with national regulatory values to determine attainment. These averages are used in comparison with Environmental Protection Agency regulatory values reported in table A.3.1. Tables are labeled by name and monitoring site ID.
Regulatory values are set standards from the Environmental Protection Agency used to determine attainment. This table provides pollutant regulatory values first as a reference for the remaining tables in this section.
U.S. Environmental Protection Agency. (2025, December 16). NAAQS table. https://www.epa.gov/criteria-air-pollutants/naaqs-table
Utah Division of Air Quality. (2025). Utah Air Monitoring Program. (All Criteria Pollutant Yearly Quicklook Summary Reports). [Data set]. Utah Department of Environmental Quality. https://air.utah.gov/dataarchive/archall.htm
Made using data from the Utah Air Monitoring Program data archive, this chart averages measures from all monitoring stations within the county boundaries. The average measure is compared with the EPA regulatory value marked using dotted lines. Measures represented in this chart are averages taken from specific monitoring stations listed in the table above.
EPA Non-Attainment Areas
The Office of Air Quality and Planning Standards. (2025). Nonattainment Areas and Designations (FeatureServer) [Data set}. U.S. Environmental Protection Agency. https://services.arcgis.com/cJ9YHowT8TU7DUyn/arcgis/rest/services/Nonattainment_Areas_and_Designations/FeatureServer
These maps highlight areas designated in non-attainment by the Environmental Protection Agency in air quality non-attainment for Ozone, Pm2.5, and PM10 respectively. Areas in maintenance are hatched indicating that air quality in the region now meets the standard but is being monitored. The severity of non-attainment is indicated by the depth of color. Areas in non-attainment are required by the EPA to set plans for emission reduction to reach attainment goals. You can view a legend for each of these maps by clicking the “i” in the top left corner.
Statewide Triennial Emissions
Utah Department of Environmental Quality. (2025). 2020 Statewide emissions inventories. [Data set]. Utah Division of Air Quality. https://deq.utah.gov/air-quality/2020statewide-emissions-inventories
Utah Department of Environmental Quality. (2025). 2017 Statewide emissions inventories. [Data set]. Utah Division of Air Quality. https://deq.utah.gov/air-quality/2017-statewide-emissions-inventories
Every third year, the Division of Air Quality releases an extended emissions report detailing what has been released into the atmosphere. This chart indicates pollutants released and does not account for the concentration of those pollutants in the atmosphere. This chart sums emissions by pollutant, excluding emissions from biogenic sources and wildfires, from the last two triannual reports. Changes in monitoring strategies make comparisons between historic reports challenging. You can use the slider to adjust the date ranges displayed, and filter by pollutant using the checklist to the right.