Processed on 2024-03-04 12:55:21 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 January.

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.

January in Delaware

January 2014 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 50 22 0 0 0 0 21
New 33 39 0 0 0 0 21

January 2015 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 65 28 0 0 0 0 0
New 49 44 0 0 0 0 0

January 2016 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 28 5 0 0 0 0 29
New 25 8 0 0 0 0 29

January 2017 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 84 9 0 0 0 0 0
New 61 32 0 0 0 0 0

January 2018 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 79 17 0 0 0 0 28
New 62 34 0 0 0 0 28

January 2019 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 133 20 0 0 0 0 2
New 113 40 0 0 0 0 2

January 2020 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 130 20 0 0 0 0 5
New 114 36 0 0 0 0 5

January 2021 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 126 29 0 0 0 0 0
New 97 58 0 0 0 0 0

January 2022 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 137 36 0 0 0 0 13
New 104 69 0 0 0 0 13

January 2023 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 163 20 0 0 0 0 3
New 130 53 0 0 0 0 3