Omaha Air Quality in September
Across 2019–2025, Omaha's September air quality had a median AQI of 47 (Good) over 210 monitored days in the Omaha-Council Bluffs, NE-IA area. 1.0% of September days (2 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 63.8% of days. The cleanest September on record here was 2022 (median AQI 44, 0 days above 100) and the worst was 2023 (median 61, 2 days above 100, peak AQI 154).
- Good: 57.6%
- Moderate: 41.4%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.5%
Reduce Indoor Ozone in Omaha
Today's main pollutant in Omaha is ground-level ozone (AQI 10). 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.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Omaha in September?
Good on a typical day: median AQI 47 across 2019–2025, with 1.0% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓57.6% of September days were Good (AQI 0–50), 41.4% Moderate (51–100).
- ✓2 days of 210 reached AQI 101+; the September peak was 154.
- ✓Best September: 2022; worst September: 2023.
Frequently asked questions
What is the air quality like in Omaha in September?▾
Across 2019–2025, the median daily AQI in Omaha in September was 47 (Good). 57.6% of days were Good, 41.4% Moderate, and 1.0% 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 Omaha?▾
A typical September day in Omaha sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of September days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Omaha's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 63.8% of September days in Omaha. The highest September AQI recorded in 2019–2025 was 154 (Unhealthy), in 2023.
Omaha September air quality, year by year
Omaha September air quality by year (Omaha-Council Bluffs, NE-IA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 46 | 0 | 64 | PM2.5 |
| 2020 | 30 | 48 | 0 | 62 | PM2.5 |
| 2021 | 30 | 48 | 0 | 59 | PM2.5 |
| 2022cleanest | 30 | 44 | 0 | 71 | O3 |
| 2023worst | 30 | 61 | 2 | 154 | O3 |
| 2024 | 30 | 48 | 0 | 84 | PM2.5 |
| 2025 | 30 | 48 | 0 | 71 | PM2.5 |
What September air means in Omaha
A typical September day in Omaha sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of September days (1.0%) reached AQI 101+ in 2019–2025.
September's median AQI of 47 is in line with Omaha's whole-year median of 47, 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 Omaha runs above the national September norm; 1.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Omaha's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Omaha
The latest EPA AirNow observation puts Omaha's AQI at 10 (O3). The figures above are multi-year month statistics, not today's reading.
View current Omaha air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Omaha-Council Bluffs, NE-IA), 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.