Oklahoma City Air Quality in May
Across 2019–2025, Oklahoma City's May air quality had a median AQI of 55 (Moderate) over 217 monitored days in the Oklahoma City, OK area. 1.4% of May days (3 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 56.7% of days. The cleanest May on record here was 2019 (median AQI 51, 0 days above 100) and the worst was 2025 (median 53, 2 days above 100, peak AQI 119).
- Good: 32.3%
- Moderate: 66.4%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.0%
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How is the air in Oklahoma City in May?
Moderate on a typical day: median AQI 55 across 2019–2025, with 1.4% of May days above AQI 100. Ground-level ozone is the main driver.
- ✓32.3% of May days were Good (AQI 0–50), 66.4% Moderate (51–100).
- ✓3 days of 217 reached AQI 101+; the May peak was 119.
- ✓Best May: 2019; worst May: 2025.
Frequently asked questions
What is the air quality like in Oklahoma City in May?▾
Across 2019–2025, the median daily AQI in Oklahoma City in May was 55 (Moderate). 32.3% of days were Good, 66.4% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is May a good time for outdoor exercise in Oklahoma City?▾
A typical May day in Oklahoma City is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of May days (1.4%) 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 May air quality problems?▾
Ground-level ozone set the daily AQI on 56.7% of May days in Oklahoma City. The highest May AQI recorded in 2019–2025 was 119 (Unhealthy for Sensitive Groups), in 2025.
Oklahoma City May air quality, year by year
Oklahoma City May air quality by year (Oklahoma City, OK, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 31 | 51 | 0 | 87 | O3 |
| 2020 | 31 | 52 | 0 | 84 | O3 |
| 2021 | 31 | 52 | 0 | 93 | PM2.5 |
| 2022 | 31 | 57 | 0 | 93 | O3 |
| 2023 | 31 | 64 | 0 | 87 | PM2.5 |
| 2024 | 31 | 67 | 1 | 119 | O3 |
| 2025worst | 31 | 53 | 2 | 119 | O3 |
What May air means in Oklahoma City
A typical May day in Oklahoma City is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of May days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
May's median AQI of 55 is in line with Oklahoma City's whole-year median of 54, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median May AQI across every EPA metro area (104,064 metro-days, 2019–2025) is 44, so Oklahoma City runs above the national May norm; 1.4% of its May days topped AQI 100 versus 1.3% nationally (about the same).
May is part of Oklahoma City's spring season (March, April, May); the spring 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 39 (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.