Processed on 2024-03-04 12:45:20 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 Arizona 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 Arizona

March 2014 – 16 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 264 13 0 0 0 0 2
New 251 26 0 0 0 0 2

March 2015 – 16 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 456 1 0 0 0 0 39
New 420 37 0 0 0 0 39

March 2016 – 34 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 423 26 0 0 0 0 16
New 348 101 0 0 0 0 16

March 2017 – 18 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 477 37 0 0 0 0 13
New 426 88 0 0 0 0 13

March 2018 – 36 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 511 11 0 0 0 0 5
New 476 46 0 0 0 0 5

March 2019 – 18 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 463 22 0 0 0 0 11
New 425 60 0 0 0 0 11

March 2020 – 39 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 547 0 0 0 0 0 11
New 540 7 0 0 0 0 11

March 2021 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 589 20 0 0 0 0 11
New 531 78 0 0 0 0 11

March 2022 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 601 39 1 0 0 0 10
New 523 117 1 0 0 0 10

March 2023 – 33 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 638 10 0 0 0 0 3
New 599 49 0 0 0 0 3