Processed on 2024-03-04 12:53:01 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 Colorado spent in each AQI category during the the month of November.

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.

November in Colorado

November 2014 – 19 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 251 27 0 0 0 0 32
New 232 46 0 0 0 0 32

November 2015 – 19 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 255 24 0 0 0 0 62
New 220 59 0 0 0 0 62

November 2016 – 30 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 299 25 0 0 0 0 17
New 251 73 0 0 0 0 17

November 2017 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 278 63 1 0 0 0 61
New 240 101 1 0 0 0 61

November 2018 – 41 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 310 45 0 0 0 0 48
New 250 105 0 0 0 0 48

November 2019 – 20 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 289 64 0 0 0 0 50
New 250 103 0 0 0 0 50

November 2020 – 39 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 418 45 0 0 0 0 33
New 387 76 0 0 0 0 33

November 2021 – 27 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 435 32 0 0 0 0 29
New 391 76 0 0 0 0 29

November 2022 – 34 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 466 25 0 0 0 0 36
New 423 68 0 0 0 0 36

November 2023 – 147 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 391 14 0 0 0 0 60
New 353 52 0 0 0 0 60