Processed on 2024-03-04 13:29:05 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 Missouri spent in each AQI category during the the month of January.

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.

January in Missouri

January 2014 – 12 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 315 46 0 0 0 0 11
New 278 83 0 0 0 0 11

January 2015 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 294 75 0 0 0 0 3
New 215 154 0 0 0 0 3

January 2016 – 27 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 311 77 0 0 0 0 15
New 233 155 0 0 0 0 15

January 2017 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 287 59 0 0 0 0 26
New 228 118 0 0 0 0 26

January 2018 – 26 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 313 53 0 0 0 0 6
New 231 135 0 0 0 0 6

January 2019 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 283 47 0 0 0 0 42
New 212 118 0 0 0 0 42

January 2020 – 27 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 334 35 0 0 0 0 3
New 272 97 0 0 0 0 3

January 2021 – 14 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 346 50 0 0 0 0 7
New 272 124 0 0 0 0 7

January 2022 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 328 34 0 0 0 0 10
New 287 75 0 0 0 0 10

January 2023 – 12 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 319 51 0 0 0 0 2
New 250 120 0 0 0 0 2