Bakersfield Air Quality in October
Across 2019–2025, Bakersfield's October air quality had a median AQI of 84 (Moderate) over 217 monitored days in the Bakersfield, CA area. 35.5% of October days (77 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 44.2% of days. The cleanest October on record here was 2025 (median AQI 68, 2 days above 100) and the worst was 2020 (median 112, 21 days above 100, peak AQI 170).
- Good: 6.5%
- Moderate: 58.1%
- Unhealthy for Sensitive Groups: 28.1%
- Unhealthy or worse: 7.4%
Reduce Indoor Ozone in Bakersfield
Today's main pollutant in Bakersfield is ground-level ozone (AQI 74). 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 Bakersfield in October?
Moderate on a typical day: median AQI 84 across 2019–2025, with 35.5% of October days above AQI 100. Ground-level ozone is the main driver.
- ✓6.5% of October days were Good (AQI 0–50), 58.1% Moderate (51–100).
- ✓77 days of 217 reached AQI 101+; the October peak was 553.
- ✓Best October: 2025; worst October: 2020.
Frequently asked questions
What is the air quality like in Bakersfield in October?▾
Across 2019–2025, the median daily AQI in Bakersfield in October was 84 (Moderate). 6.5% of days were Good, 58.1% Moderate, and 35.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is October a good time for outdoor exercise in Bakersfield?▾
A typical October day in Bakersfield is Moderate (median AQI 84): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of October days (35.5%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Bakersfield's October air quality problems?▾
Ground-level ozone set the daily AQI on 44.2% of October days in Bakersfield. The highest October AQI recorded in 2019–2025 was 553 (Hazardous), in 2020.
Bakersfield October air quality, year by year
Bakersfield October air quality by year (Bakersfield, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 87 | 12 | 553 | O3 |
| 2020worst | 31 | 112 | 21 | 170 | O3 |
| 2021 | 31 | 69 | 9 | 314 | PM2.5 |
| 2022 | 31 | 105 | 17 | 289 | O3 |
| 2023 | 31 | 67 | 6 | 143 | O3 |
| 2024 | 31 | 84 | 10 | 177 | O3 |
| 2025cleanest | 31 | 68 | 2 | 119 | PM2.5 |
What October air means in Bakersfield
A typical October day in Bakersfield is Moderate (median AQI 84): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of October days (35.5%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
October's median AQI of 84 is above Bakersfield's whole-year median of 72, making it one of the area's dirtier periods. Nationally, the median October AQI across every EPA metro area (102,872 metro-days, 2019–2025) is 38, so Bakersfield runs above the national October norm; 35.5% of its October days topped AQI 100 versus 1.3% nationally (above average).
October is part of Bakersfield's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Bakersfield
The latest EPA AirNow observation puts Bakersfield's AQI at 74 (O3). The figures above are multi-year month statistics, not today's reading.
View current Bakersfield air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Bakersfield, CA), 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.