Processed on 2024-03-04 13:53:31 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 Oregon 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 Oregon

March 2014 – 26 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 631 25 0 0 0 0 26
New 577 79 0 0 0 0 26

March 2015 – 30 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 579 53 0 0 0 0 19
New 522 110 0 0 0 0 19

March 2016 – 70 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 646 4 2 0 0 0 30
New 632 18 2 0 0 0 30

March 2017 – 32 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 674 21 0 0 0 0 18
New 646 49 0 0 0 0 18

March 2018 – 78 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 541 20 0 0 0 0 152
New 500 61 0 0 0 0 152

March 2019 – 37 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 675 54 0 0 0 0 108
New 584 145 0 0 0 0 108

March 2020 – 106 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 793 30 0 0 0 0 76
New 732 91 0 0 0 0 76

March 2021 – 67 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1526 174 0 1 0 0 66
New 1348 352 0 1 0 0 66

March 2022 – 72 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1889 61 0 0 0 0 34
New 1803 147 0 0 0 0 34

March 2023 – 79 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1994 50 0 0 0 0 64
New 1899 145 0 0 0 0 64