Oklahoma City Air Quality in September
Across 2019–2025, Oklahoma City's September air quality had a median AQI of 61 (Moderate) over 210 monitored days in the Oklahoma City, OK area. 4.3% of September days (9 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 56.2% of days. The cleanest September on record here was 2019 (median AQI 54, 0 days above 100) and the worst was 2023 (median 71, 3 days above 100, peak AQI 115).
- Good: 26.7%
- Moderate: 69.0%
- Unhealthy for Sensitive Groups: 4.3%
- Unhealthy or worse: 0.0%
Extra Protection for Oklahoma City Homes
Air quality in Oklahoma City is moderate (AQI 73), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Oklahoma City in September?
Moderate on a typical day: median AQI 61 across 2019–2025, with 4.3% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓26.7% of September days were Good (AQI 0–50), 69.0% Moderate (51–100).
- ✓9 days of 210 reached AQI 101+; the September peak was 129.
- ✓Best September: 2019; worst September: 2023.
Frequently asked questions
What is the air quality like in Oklahoma City in September?▾
Across 2019–2025, the median daily AQI in Oklahoma City in September was 61 (Moderate). 26.7% of days were Good, 69.0% Moderate, and 4.3% 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 Oklahoma City?▾
A typical September day in Oklahoma City is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 23 of September days (4.3%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Oklahoma City's September air quality problems?▾
Ground-level ozone set the daily AQI on 56.2% of September days in Oklahoma City. The highest September AQI recorded in 2019–2025 was 129 (Unhealthy for Sensitive Groups), in 2023.
Oklahoma City September air quality, year by year
Oklahoma City September air quality by year (Oklahoma City, OK, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 54 | 0 | 100 | PM2.5 |
| 2020 | 30 | 56 | 1 | 112 | PM2.5 |
| 2021 | 30 | 64 | 1 | 101 | PM2.5 |
| 2022 | 30 | 60 | 2 | 129 | O3 |
| 2023worst | 30 | 71 | 3 | 115 | O3 |
| 2024 | 30 | 53 | 1 | 119 | O3 |
| 2025 | 30 | 64 | 1 | 126 | O3 |
What September air means in Oklahoma City
A typical September day in Oklahoma City is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 23 of September days (4.3%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
September's median AQI of 61 is above Oklahoma City's whole-year median of 54, making it one of the area's dirtier periods. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Oklahoma City runs above the national September norm; 4.3% of its September days topped AQI 100 versus 2.7% nationally (above average).
September is part of Oklahoma City's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Oklahoma City
The latest EPA AirNow observation puts Oklahoma City's AQI at 73 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Oklahoma City air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Oklahoma City, OK), 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.