Lincoln Air Quality in September
Across 2019–2025, Lincoln's September air quality had a median AQI of 36 (Good) over 210 monitored days in the Lincoln, NE area. 0.5% of September days (1 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 77.1% of days. The cleanest September on record here was 2020 (median AQI 33, 0 days above 100) and the worst was 2023 (median 46, 1 day above 100, peak AQI 160).
- Good: 85.2%
- Moderate: 14.3%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.5%
Improve Indoor Air Quality
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How is the air in Lincoln in September?
Good on a typical day: median AQI 36 across 2019–2025, with 0.5% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓85.2% of September days were Good (AQI 0–50), 14.3% Moderate (51–100).
- ✓1 day of 210 reached AQI 101+; the September peak was 160.
- ✓Best September: 2020; worst September: 2023.
Frequently asked questions
What is the air quality like in Lincoln in September?▾
Across 2019–2025, the median daily AQI in Lincoln in September was 36 (Good). 85.2% of days were Good, 14.3% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Lincoln?▾
A typical September day in Lincoln 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 Lincoln's September air quality problems?▾
Ground-level ozone set the daily AQI on 77.1% of September days in Lincoln. The highest September AQI recorded in 2019–2025 was 160 (Unhealthy), in 2023.
Lincoln September air quality, year by year
Lincoln September air quality by year (Lincoln, NE, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 34 | 0 | 51 | O3 |
| 2020cleanest | 30 | 33 | 0 | 59 | O3 |
| 2021 | 30 | 36 | 0 | 57 | O3 |
| 2022 | 30 | 35 | 0 | 52 | O3 |
| 2023worst | 30 | 46 | 1 | 160 | O3 |
| 2024 | 30 | 38 | 0 | 62 | O3 |
| 2025 | 30 | 41 | 0 | 71 | O3 |
What September air means in Lincoln
A typical September day in Lincoln 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.
Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Lincoln runs below the national September norm; 0.5% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Lincoln's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Lincoln
The latest EPA AirNow observation puts Lincoln's AQI at 34 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Lincoln air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Lincoln, NE), 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.