Processed on 2024-03-04 14:08:39 PST.

Disclaimer: Data presented here come from a variety of sources and do not represent official EPA measurements. Please visit AirNow for official measurements.

Cumulative exposure to smoke is an important public health metric. This report summarizes the cumulative number of days air quality monitors in Utah spent in each AQI category during the the month of September.

The tables below include only permanent monitors measuring PM2.5 and show cumulative exposure under existing NAAQS (National Ambient Air Quality Standards) and under the 2024 revised standards for PM2.5.

In the tables and plots below, ‘Old’ designates cumulative days calculated using the 2023 PM2.5 NAAQS while ‘New’ is calculated using the 2024 revised PM2.5 NAAQS. The impact of the NAAQS revision is quite clear.

September in Utah

September 2014 – 2 permanent monitors

September 2015 – 0 monitors in AirFire data archive

September 2016 – 15 permanent monitors

Processing error: Unable to calculate tables.

September 2017 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 142 35 3 0 0 0 6
New 126 51 3 0 0 0 6

September 2018 – 25 permanent monitors

Processing error: Unable to calculate tables.

September 2019 – 12 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 340 10 0 0 0 0 22
New 320 30 0 0 0 0 22

September 2020 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 23 7 0 0 0 0 1
New 19 11 0 0 0 0 1

September 2021 – 17 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 330 177 0 0 0 0 20
New 243 264 0 0 0 0 20

September 2022 – 19 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 448 79 6 1 0 0 24
New 399 128 6 1 0 0 24

September 2023 – 22 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 598 0 0 0 0 0 22
New 589 9 0 0 0 0 22