Oklahoma City Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Oklahoma City (Oklahoma City, OK area) was March 14, 2025, when the daily AQI reached 459 (Hazardous), set by coarse dust (PM10). Across 2,557 monitored days in 2019–2025, 1 of the 10 worst days was Unhealthy (AQI 151+) or worse; 8 of the 10 were driven by ground-level ozone and 1 by coarse dust (PM10), and 4 of them fell in 2024. The cleanest day was December 25, 2023 at AQI 8 (Good); the 10 best days span 4 different years.
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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When were Oklahoma City's worst and best air quality days?
Worst: March 14, 2025, AQI 459 (Hazardous, PM10). Best: December 25, 2023, AQI 8 (Good). Based on 2,557 EPA-monitored days in the Oklahoma City, OK area, 2019–2025.
- ✓1 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 129 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone drove 8 of the 10 worst days.
- ✓2024 accounts for 4 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Oklahoma City?▾
March 14, 2025: the Oklahoma City, OK area's daily AQI hit 459 (Hazardous), driven by coarse dust (PM10). That is the highest of 2,557 monitored days in 2019–2025.
What was the best air quality day in Oklahoma City?▾
December 25, 2023, with a daily AQI of 8 (Good). The daily AQI is the highest reading from any monitor in the area, so even the cleanest day reflects the area's worst monitor.
What was Oklahoma City's worst air quality day in 2025?▾
March 14, 2025, AQI 459 (Hazardous), set by coarse dust (PM10).
Which pollutant causes Oklahoma City's worst air days?▾
Ground-level ozone set the AQI on 8 of the 10 worst days; coarse dust (PM10) on 1. The tables above list the defining pollutant for every day.
Oklahoma City's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Oklahoma City, OK area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2025 page) | 459 | Hazardous | PM10 — coarse dust (PM10) |
| 2 | (2024 page) | 147 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
| 3 | (2023 page) | 143 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 4 | (2021 page) | 140 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 5 | (2021 page) | 138 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 6 | (2024 page) | 136 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 7 | (2024 page) | 133 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
| 8 | (2021 page) | 133 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 9 | (2024 page) | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 10 | (2022 page) | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
Worst day of each year in Oklahoma City
The single highest-AQI day in each year on record. Click a year for its full month-by-month statistics.
| Year | Worst day | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 2019 | 119 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2020 | 121 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2021 | 140 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2022 | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone | |
| 2023 | 143 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2024 | 147 | Unhealthy for Sensitive Groups | O3 — ground-level ozone | |
| 2025 | 459 | Hazardous | PM10 — coarse dust (PM10) |
Oklahoma City's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Oklahoma City, OK area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2023 page) | 8 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 2 | (2023 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 3 | (2020 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 4 | (2023 page) | 16 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 5 | (2025 page) | 17 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2025 page) | 17 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 7 | (2023 page) | 17 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 8 | (2023 page) | 20 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 9 | (2024 page) | 21 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 10 | (2025 page) | 22 | Good | PM2.5 — fine particulate matter (PM2.5) |
Right now in Oklahoma City
The latest EPA AirNow observation puts Oklahoma City's AQI at 73 (PM2.5). The days above are historical records, 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.