Processed on 2024-03-04 14:03:38 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 Tennessee spent in each AQI category during the the month of March.

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.

March in Tennessee

March 2014 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 117 65 0 0 0 0 4
New 61 121 0 0 0 0 4

March 2015 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 157 27 0 0 0 0 2
New 106 78 0 0 0 0 2

March 2016 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 145 38 0 0 0 0 3
New 91 92 0 0 0 0 3

March 2017 – 7 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 115 14 0 0 0 0 26
New 95 34 0 0 0 0 26

March 2018 – 16 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 182 34 0 0 0 0 1
New 148 68 0 0 0 0 1

March 2019 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 202 33 0 0 0 0 13
New 164 71 0 0 0 0 13

March 2020 – 16 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 222 17 0 0 0 0 9
New 201 38 0 0 0 0 9

March 2021 – 9 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 207 28 0 0 0 0 13
New 191 44 0 0 0 0 13

March 2022 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 211 33 0 0 0 0 4
New 172 72 0 0 0 0 4

March 2023 – 11 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 238 63 0 0 0 0 9
New 190 111 0 0 0 0 9