Processed on 2024-03-04 12:55:40 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 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 Delaware

March 2014 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 72 19 0 0 0 0 2
New 43 48 0 0 0 0 2

March 2015 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 61 27 0 0 0 0 5
New 46 42 0 0 0 0 5

March 2016 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 42 7 0 0 0 0 13
New 38 11 0 0 0 0 13

March 2017 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 87 6 0 0 0 0 0
New 75 18 0 0 0 0 0

March 2018 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 101 4 0 0 0 0 19
New 85 20 0 0 0 0 19

March 2019 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 135 20 0 0 0 0 0
New 96 59 0 0 0 0 0

March 2020 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 147 6 0 0 0 0 2
New 118 35 0 0 0 0 2

March 2021 – 5 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 135 18 0 0 0 0 2
New 109 44 0 0 0 0 2

March 2022 – 6 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 145 24 0 0 0 0 17
New 113 56 0 0 0 0 17

March 2023 – 8 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 218 24 0 0 0 0 6
New 182 60 0 0 0 0 6