Processed on 2024-03-04 13:23:09 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 Michigan 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 Michigan

January 2014 – 2 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 43 14 0 0 0 0 5
New 29 28 0 0 0 0 5

January 2015 – 2 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 41 12 0 0 0 0 9
New 25 28 0 0 0 0 9

January 2016 – 18 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 47 14 0 0 0 0 1
New 28 33 0 0 0 0 1

January 2017 – 1 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 26 5 0 0 0 0 0
New 14 17 0 0 0 0 0

January 2018 – 19 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 19 12 0 0 0 0 0
New 12 19 0 0 0 0 0

January 2019 – 2 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 24 4 0 0 0 0 3
New 14 14 0 0 0 0 3

January 2020 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 44 14 0 0 0 0 4
New 29 29 0 0 0 0 4

January 2021 – 20 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 55 31 0 0 0 0 7
New 37 49 0 0 0 0 7

January 2022 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 399 188 4 0 0 0 29
New 279 308 4 0 0 0 29

January 2023 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 366 271 0 0 0 0 14
New 238 399 0 0 0 0 14