Oakland Air Quality in 2019
In 2019, Oakland's air quality (San Francisco-Oakland-Hayward, CA area) had a median daily AQI of 51 (Moderate) across 365 monitored days. 9 days (2.5%) reached Unhealthy for Sensitive Groups or worse, 177 were Good, and the year's peak AQI was 150 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 259 of those days. The cleanest month of 2019 was February (median AQI 40, 0 days above 100) and the worst was June (median 54, 3 days above 100, peak 150).
- Good: 48.5%
- Moderate: 49.0%
- Unhealthy for Sensitive Groups: 2.5%
- Unhealthy or worse: 0.0%
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How was Oakland's air quality in 2019?
Moderate on a typical day: median AQI 51, with 9 days above AQI 100 out of 365 monitored — the 3rd cleanest of 6 years on record for the area.
- ✓Peak AQI in 2019: 150 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 259 days.
- ✓Cleanest month: February; worst: June.
Frequently asked questions
What was the average AQI in Oakland in 2019?▾
EPA's Air Quality System puts Oakland's (San Francisco-Oakland-Hayward, CA) median daily AQI for 2019 at 51, which is Moderate. 9 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 150.
Which month had the worst air quality in Oakland in 2019?▾
The cleanest month of 2019 was February (median AQI 40, 0 days above 100) and the worst was June (median 54, 3 days above 100, peak 150).
Was 2019 a good or bad year for Oakland's air?▾
Among the 6 years EPA has published for the area (2019–2024), 2019 ranks 3rd cleanest by days above AQI 100. 2019's median of 51 is in line with the area's typical annual median of 53.
Oakland month by month in 2019
Oakland air quality month by month, 2019 (San Francisco-Oakland-Hayward, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 56 | 0 | 89 | PM2.5 |
| Februarycleanest | 28 | 40 | 0 | 55 | O3 |
| March | 31 | 44 | 0 | 62 | PM2.5 |
| April | 30 | 52 | 0 | 74 | PM2.5 |
| May | 31 | 44 | 0 | 63 | PM2.5 |
| Juneworst | 30 | 54 | 3 | 150 | PM2.5 |
| July | 31 | 54 | 2 | 105 | PM2.5 |
| August | 31 | 50 | 3 | 119 | PM2.5 |
| September | 30 | 48 | 0 | 97 | PM2.5 |
| October | 31 | 57 | 1 | 102 | PM2.5 |
| November | 30 | 62 | 0 | 95 | PM2.5 |
| December | 31 | 46 | 0 | 82 | PM2.5 |
How 2019 compares
Among the 6 years EPA has published for the area (2019–2024), 2019 ranks 3rd cleanest by days above AQI 100.
2019's median of 51 is in line with the area's typical annual median of 53.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Oakland
The latest EPA AirNow observation puts Oakland's AQI at 47 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Oakland air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (San Francisco-Oakland-Hayward, 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.