Processed on 2024-03-04 14:14:18 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 Washington spent in each AQI category during the the month of July.

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.

July in Washington

July 2014 – 30 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 822 60 4 0 0 0 74
New 750 131 5 0 0 0 74

July 2015 – 41 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 873 92 0 0 0 0 59
New 792 172 1 0 0 0 59

July 2016 – 112 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1121 10 0 0 0 0 117
New 1093 38 0 0 0 0 117

July 2017 – 52 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1282 38 0 0 0 0 88
New 1231 89 0 0 0 0 88

July 2018 – 130 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1348 151 0 0 0 0 101
New 1250 249 0 0 0 0 101

July 2019 – 67 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1664 20 0 0 0 0 140
New 1629 55 0 0 0 0 140

July 2020 – 129 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1641 41 1 0 0 0 141
New 1568 114 1 0 0 0 141

July 2021 – 71 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 1658 220 33 25 7 0 137
New 1509 369 33 20 11 1 137

July 2022 – 83 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 2015 57 0 0 0 0 104
New 1929 143 0 0 0 0 104

July 2023 – 106 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 2209 76 5 5 0 0 137
New 2137 148 5 5 0 0 137