Processed on 2024-03-04 13:07:03 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 Illinois 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 Illinois

November 2014 – 11 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 268 34 0 0 0 0 39
New 209 93 0 0 0 0 39

November 2015 – 12 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 266 74 0 0 0 0 32
New 182 158 0 0 0 0 32

November 2016 – 26 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 246 64 0 0 0 0 93
New 169 141 0 0 0 0 93

November 2017 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 443 123 0 0 0 0 54
New 267 299 0 0 0 0 54

November 2018 – 40 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 362 131 0 0 0 0 65
New 253 240 0 0 0 0 65

November 2019 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 364 166 0 0 0 0 121
New 258 272 0 0 0 0 121

November 2020 – 43 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 479 110 0 0 0 0 93
New 356 233 0 0 0 0 93

November 2021 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 505 168 0 0 0 0 40
New 391 282 0 0 0 0 40

November 2022 – 24 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 480 194 0 0 0 0 70
New 316 358 0 0 0 0 70

November 2023 – 26 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 624 114 0 0 0 0 37
New 460 278 0 0 0 0 37