Stockton Air Quality in 2023
In 2023, Stockton's air quality (Stockton-Lodi, CA area) had a median daily AQI of 47 (Good) across 365 monitored days. 9 days (2.5%) reached Unhealthy for Sensitive Groups or worse, 208 were Good, and the year's peak AQI was 119 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 194 of those days. The cleanest month of 2023 was May (median AQI 38, 0 days above 100) and the worst was December (median 69, 5 days above 100, peak 111).
- Good: 57.0%
- Moderate: 40.5%
- Unhealthy for Sensitive Groups: 2.5%
- Unhealthy or worse: 0.0%
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How was Stockton's air quality in 2023?
Good on a typical day: median AQI 47, with 9 days above AQI 100 out of 365 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 119 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 194 days.
- ✓Cleanest month: May; worst: December.
Frequently asked questions
What was the average AQI in Stockton in 2023?▾
EPA's Air Quality System puts Stockton's (Stockton-Lodi, CA) median daily AQI for 2023 at 47, which is Good. 9 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 119.
Which month had the worst air quality in Stockton in 2023?▾
The cleanest month of 2023 was May (median AQI 38, 0 days above 100) and the worst was December (median 69, 5 days above 100, peak 111).
Was 2023 a good or bad year for Stockton's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 2nd cleanest by days above AQI 100. 2023's median of 47 is in line with the area's typical annual median of 48.
Stockton month by month in 2023
Stockton air quality month by month, 2023 (Stockton-Lodi, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 40 | 0 | 91 | PM2.5 |
| February | 28 | 59 | 2 | 114 | PM2.5 |
| March | 31 | 39 | 0 | 73 | O3 |
| April | 30 | 42 | 1 | 119 | O3 |
| Maycleanest | 31 | 38 | 0 | 56 | O3 |
| June | 30 | 40 | 0 | 55 | O3 |
| July | 31 | 48 | 0 | 80 | O3 |
| August | 31 | 52 | 0 | 99 | PM2.5 |
| September | 30 | 45 | 1 | 107 | PM2.5 |
| October | 31 | 51 | 0 | 90 | PM2.5 |
| November | 30 | 66 | 0 | 99 | PM2.5 |
| Decemberworst | 31 | 69 | 5 | 111 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 2nd cleanest by days above AQI 100.
2023's median of 47 is in line with the area's typical annual median of 48.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Stockton
The latest EPA AirNow observation puts Stockton's AQI at 49 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Stockton air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Stockton-Lodi, 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.