Erie Air Quality in 2019
In 2019, Erie's air quality (Erie, PA area) had a median daily AQI of 39 (Good) across 364 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 271 were Good, and the year's peak AQI was 93 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 186 of those days. The cleanest month of 2019 was October (median AQI 32, 0 days above 100) and the worst was March (median 49, 0 days above 100, peak 78).
- Good: 74.5%
- Moderate: 25.5%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Erie
Today's main pollutant in Erie is ground-level ozone (AQI 21). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
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How was Erie's air quality in 2019?
Good on a typical day: median AQI 39, with 0 days above AQI 100 out of 364 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 93 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 186 days.
- ✓Cleanest month: October; worst: March.
Frequently asked questions
What was the average AQI in Erie in 2019?▾
EPA's Air Quality System puts Erie's (Erie, PA) median daily AQI for 2019 at 39, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 93.
Which month had the worst air quality in Erie in 2019?▾
The cleanest month of 2019 was October (median AQI 32, 0 days above 100) and the worst was March (median 49, 0 days above 100, peak 78).
Was 2019 a good or bad year for Erie's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 5th cleanest by days above AQI 100. 2019's median of 39 is in line with the area's typical annual median of 38.
Erie month by month in 2019
Erie air quality month by month, 2019 (Erie, PA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 35 | 0 | 67 | PM2.5 |
| February | 28 | 41 | 0 | 69 | PM2.5 |
| Marchworst | 31 | 49 | 0 | 78 | PM2.5 |
| April | 30 | 37 | 0 | 64 | O3 |
| May | 31 | 39 | 0 | 57 | PM2.5 |
| June | 30 | 40 | 0 | 71 | O3 |
| July | 31 | 46 | 0 | 93 | PM2.5 |
| August | 31 | 42 | 0 | 77 | O3 |
| September | 29 | 36 | 0 | 64 | O3 |
| Octobercleanest | 31 | 32 | 0 | 54 | O3 |
| November | 30 | 37 | 0 | 74 | PM2.5 |
| December | 31 | 41 | 0 | 66 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 5th cleanest by days above AQI 100.
2019's median of 39 is in line with the area's typical annual median of 38.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Erie
The latest EPA AirNow observation puts Erie's AQI at 21 (O3). The figures above are multi-year annual 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.