Processed on 2024-03-04 12:56:20 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 Delaware 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 Delaware

July 2014 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 82 10 0 0 0 0 4
New 56 36 0 0 0 0 4

July 2015 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 72 21 0 0 0 0 3
New 46 47 0 0 0 0 3

July 2016 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 68 16 0 0 0 0 12
New 45 39 0 0 0 0 12

July 2017 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 78 13 0 0 0 0 5
New 60 31 0 0 0 0 5

July 2018 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 109 13 0 0 0 0 6
New 92 30 0 0 0 0 6

July 2019 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 140 15 0 0 0 0 5
New 102 53 0 0 0 0 5

July 2020 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 142 13 0 0 0 0 5
New 102 53 0 0 0 0 5

July 2021 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 83 54 4 0 0 0 19
New 51 86 4 0 0 0 19

July 2022 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 174 12 0 0 0 0 6
New 129 57 0 0 0 0 6

July 2023 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 168 76 2 0 0 0 10
New 109 135 2 0 0 0 10