Oklahoma City Air Quality in 2021
In 2021, Oklahoma City's air quality (Oklahoma City, OK area) had a median daily AQI of 56 (Moderate) across 365 monitored days. 10 days (2.7%) reached Unhealthy for Sensitive Groups or worse, 110 were Good, and the year's peak AQI was 140 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 278 of those days. The cleanest month of 2021 was November (median AQI 45, 0 days above 100) and the worst was June (median 58, 3 days above 100, peak 140).
- Good: 30.1%
- Moderate: 67.1%
- Unhealthy for Sensitive Groups: 2.7%
- Unhealthy or worse: 0.0%
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How was Oklahoma City's air quality in 2021?
Moderate on a typical day: median AQI 56, with 10 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 140 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 278 days.
- ✓Cleanest month: November; worst: June.
Frequently asked questions
What was the average AQI in Oklahoma City in 2021?▾
EPA's Air Quality System puts Oklahoma City's (Oklahoma City, OK) median daily AQI for 2021 at 56, which is Moderate. 10 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 140.
Which month had the worst air quality in Oklahoma City in 2021?▾
The cleanest month of 2021 was November (median AQI 45, 0 days above 100) and the worst was June (median 58, 3 days above 100, peak 140).
Was 2021 a good or bad year for Oklahoma City's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 5th cleanest by days above AQI 100. 2021's median of 56 is in line with the area's typical annual median of 54.
Oklahoma City month by month in 2021
Oklahoma City air quality month by month, 2021 (Oklahoma City, OK, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 57 | 0 | 79 | PM2.5 |
| February | 28 | 57 | 0 | 90 | PM2.5 |
| March | 31 | 56 | 0 | 80 | PM2.5 |
| April | 30 | 59 | 2 | 106 | PM2.5 |
| May | 31 | 52 | 0 | 93 | PM2.5 |
| Juneworst | 30 | 58 | 3 | 140 | PM2.5 |
| July | 31 | 66 | 1 | 102 | PM2.5 |
| August | 31 | 58 | 3 | 138 | PM2.5 |
| September | 30 | 64 | 1 | 101 | PM2.5 |
| October | 31 | 48 | 0 | 100 | O3 |
| Novembercleanest | 30 | 45 | 0 | 61 | PM2.5 |
| December | 31 | 52 | 0 | 78 | PM2.5 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 5th cleanest by days above AQI 100.
2021's median of 56 is in line with the area's typical annual median of 54.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Oklahoma City
The latest EPA AirNow observation puts Oklahoma City's AQI at 25 (PM2.5). The figures above are multi-year annual 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.