Processed on 2024-03-04 13:55:19 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 Pennsylvania 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 Pennsylvania

January 2014 – 2 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 45 16 1 0 0 0 0
New 24 37 1 0 0 0 0

January 2015 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 38 24 0 0 0 0 0
New 21 41 0 0 0 0 0

January 2016 – 31 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 36 23 3 0 0 0 0
New 24 35 3 0 0 0 0

January 2017 – 3 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 72 16 1 0 0 0 4
New 51 37 1 0 0 0 4

January 2018 – 52 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 59 34 0 0 0 0 0
New 32 60 1 0 0 0 0

January 2019 – 28 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 376 141 2 0 0 0 39
New 264 253 2 0 0 0 39

January 2020 – 75 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 679 162 2 0 0 0 25
New 543 297 3 0 0 0 25

January 2021 – 42 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 924 261 1 0 0 0 54
New 702 483 1 0 0 0 54

January 2022 – 45 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 850 359 5 1 0 0 25
New 577 632 5 1 0 0 25

January 2023 – 46 permanent monitors

Good Moderate USG Unhealthy Very Unhealthy Hazardous Missing
Old 843 286 1 0 0 0 17
New 606 523 1 0 0 0 17