Erie Air Quality in September
Across 2019–2025, Erie's September air quality had a median AQI of 36 (Good) over 209 monitored days in the Erie, PA area. 0.0% of September days (0 of 209) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.1% of days. The cleanest September on record here was 2022 (median AQI 31, 0 days above 100) and the worst was 2024 (median 42, 0 days above 100, peak AQI 67).
- Good: 87.1%
- Moderate: 12.9%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Improve Indoor Air Quality
Even with good outdoor air in Erie, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Recommended: Levoit Core 400S — True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Erie in September?
Good on a typical day: median AQI 36 across 2019–2025, with 0.0% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓87.1% of September days were Good (AQI 0–50), 12.9% Moderate (51–100).
- ✓0 days of 209 reached AQI 101+; the September peak was 87.
- ✓Best September: 2022; worst September: 2024.
Frequently asked questions
What is the air quality like in Erie in September?▾
Across 2019–2025, the median daily AQI in Erie in September was 36 (Good). 87.1% of days were Good, 12.9% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 209 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Erie?▾
A typical September day in Erie sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
Which pollutant causes Erie's September air quality problems?▾
Ground-level ozone set the daily AQI on 65.1% of September days in Erie. The highest September AQI recorded in 2019–2025 was 87 (Moderate), in 2024.
Erie September air quality, year by year
Erie September air quality by year (Erie, PA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 29 | 36 | 0 | 64 | O3 |
| 2020 | 30 | 36 | 0 | 87 | O3 |
| 2021 | 30 | 35 | 0 | 48 | O3 |
| 2022cleanest | 30 | 31 | 0 | 58 | O3 |
| 2023 | 30 | 40 | 0 | 61 | PM2.5 |
| 2024worst | 30 | 42 | 0 | 67 | O3 |
| 2025 | 30 | 41 | 0 | 58 | PM2.5 |
What September air means in Erie
A typical September day in Erie sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
September's median AQI of 36 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 September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Erie runs below the national September norm; 0.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Erie's fall season (September, October, November); the fall 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.