Stockton Air Quality in 2025
In 2025, Stockton's air quality (Stockton-Lodi, CA area) had a median daily AQI of 46 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 219 were Good, and the year's peak AQI was 93 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 196 of those days. The cleanest month of 2025 was March (median AQI 42, 0 days above 100) and the worst was January (median 69, 0 days above 100, peak 93).
- Good: 60.0%
- Moderate: 40.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Stockton Homes
Air quality in Stockton is moderate (AQI 60), with particle pollution 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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How was Stockton's air quality in 2025?
Good on a typical day: median AQI 46, with 0 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 93 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 196 days.
- ✓Cleanest month: March; worst: January.
Frequently asked questions
What was the average AQI in Stockton in 2025?▾
EPA's Air Quality System puts Stockton's (Stockton-Lodi, CA) median daily AQI for 2025 at 46, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 93.
Which month had the worst air quality in Stockton in 2025?▾
The cleanest month of 2025 was March (median AQI 42, 0 days above 100) and the worst was January (median 69, 0 days above 100, peak 93).
Was 2025 a good or bad year for Stockton's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2025's median of 46 is in line with the area's typical annual median of 48.
Stockton month by month in 2025
Stockton air quality month by month, 2025 (Stockton-Lodi, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januaryworst | 31 | 69 | 0 | 93 | PM2.5 |
| February | 28 | 43 | 0 | 78 | PM2.5 |
| Marchcleanest | 31 | 42 | 0 | 62 | O3 |
| April | 30 | 44 | 0 | 57 | O3 |
| May | 31 | 46 | 0 | 57 | O3 |
| June | 30 | 49 | 0 | 67 | O3 |
| July | 31 | 42 | 0 | 80 | O3 |
| August | 31 | 43 | 0 | 57 | O3 |
| September | 30 | 48 | 0 | 74 | O3 |
| October | 31 | 42 | 0 | 65 | PM2.5 |
| November | 30 | 54 | 0 | 82 | PM2.5 |
| December | 31 | 59 | 0 | 87 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2025's median of 46 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 60 (PM10). 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.