Processed on 2024-03-04 13:20:47 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 Maryland spent in each AQI category during the the month of November.

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.

November in Maryland

November 2014 – 9 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 153 35 0 0 0 0 60
New 103 85 0 0 0 0 60

November 2015 – 9 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 179 35 0 0 0 0 65
New 135 79 0 0 0 0 65

November 2016 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 207 70 0 0 0 0 33
New 152 125 0 0 0 0 33

November 2017 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 186 64 0 0 0 0 29
New 118 132 0 0 0 0 29

November 2018 – 21 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 220 37 0 0 0 0 53
New 171 86 0 0 0 0 53

November 2019 – 10 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 232 26 0 0 0 0 52
New 187 71 0 0 0 0 52

November 2020 – 23 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 291 37 0 0 0 0 44
New 242 86 0 0 0 0 44

November 2021 – 12 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 316 24 0 0 0 0 32
New 246 94 0 0 0 0 32

November 2022 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 308 16 0 0 0 0 48
New 268 56 0 0 0 0 48

November 2023 – 13 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 323 32 0 0 0 0 48
New 269 86 0 0 0 0 48