Erie Air Quality in December
Across 2019–2025, Erie's December air quality had a median AQI of 38 (Good) over 214 monitored days in the Erie, PA area. 0.0% of December days (0 of 214) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 74.8% of days. The cleanest December on record here was 2025 (median AQI 31, 0 days above 100) and the worst was 2022 (median 41, 0 days above 100, peak AQI 73).
- Good: 76.2%
- Moderate: 23.8%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Erie in December?
Good on a typical day: median AQI 38 across 2019–2025, with 0.0% of December days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓76.2% of December days were Good (AQI 0–50), 23.8% Moderate (51–100).
- ✓0 days of 214 reached AQI 101+; the December peak was 73.
- ✓Best December: 2025; worst December: 2022.
Frequently asked questions
What is the air quality like in Erie in December?▾
Across 2019–2025, the median daily AQI in Erie in December was 38 (Good). 76.2% of days were Good, 23.8% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 214 monitored days in EPA's Air Quality System.
Is December a good time for outdoor exercise in Erie?▾
A typical December day in Erie sits in the Good range (median AQI 38), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
Which pollutant causes Erie's December air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 74.8% of December days in Erie. The highest December AQI recorded in 2019–2025 was 73 (Moderate), in 2022.
Erie December air quality, year by year
Erie December air quality by year (Erie, PA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 41 | 0 | 66 | PM2.5 |
| 2020 | 28 | 33 | 0 | 67 | PM2.5 |
| 2021 | 31 | 41 | 0 | 68 | PM2.5 |
| 2022worst | 31 | 41 | 0 | 73 | PM2.5 |
| 2023 | 31 | 35 | 0 | 55 | PM2.5 |
| 2024 | 31 | 34 | 0 | 56 | PM2.5 |
| 2025cleanest | 31 | 31 | 0 | 69 | PM2.5 |
What December air means in Erie
A typical December day in Erie sits in the Good range (median AQI 38), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
December's median AQI of 38 is in line with Erie's whole-year median of 38, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median December AQI across every EPA metro area (95,590 metro-days, 2019–2025) is 39, so Erie runs in line with the national December norm; 0.0% of its December days topped AQI 100 versus 0.7% nationally (about the same).
December is part of Erie's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Erie
The latest EPA AirNow observation puts Erie's AQI at 40 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Erie air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Erie, PA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.