Stockton Air Quality in August
Across 2019–2025, Stockton's August air quality had a median AQI of 52 (Moderate) over 217 monitored days in the Stockton-Lodi, CA area. 7.4% of August days (16 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 53.9% of days. The cleanest August on record here was 2025 (median AQI 43, 0 days above 100) and the worst was 2020 (median 67, 9 days above 100, peak AQI 194).
- Good: 45.2%
- Moderate: 47.5%
- Unhealthy for Sensitive Groups: 4.6%
- Unhealthy or worse: 2.8%
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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Stockton in August?
Moderate on a typical day: median AQI 52 across 2019–2025, with 7.4% of August days above AQI 100. Ground-level ozone is the main driver.
- ✓45.2% of August days were Good (AQI 0–50), 47.5% Moderate (51–100).
- ✓16 days of 217 reached AQI 101+; the August peak was 194.
- ✓Best August: 2025; worst August: 2020.
Frequently asked questions
What is the air quality like in Stockton in August?▾
Across 2019–2025, the median daily AQI in Stockton in August was 52 (Moderate). 45.2% of days were Good, 47.5% Moderate, and 7.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is August a good time for outdoor exercise in Stockton?▾
A typical August day in Stockton is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 14 of August days (7.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Stockton's August air quality problems?▾
Ground-level ozone set the daily AQI on 53.9% of August days in Stockton. The highest August AQI recorded in 2019–2025 was 194 (Unhealthy), in 2020.
Stockton August air quality, year by year
Stockton August air quality by year (Stockton-Lodi, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 51 | 1 | 115 | O3 |
| 2020worst | 31 | 67 | 9 | 194 | PM2.5 |
| 2021 | 31 | 67 | 5 | 153 | PM2.5 |
| 2022 | 31 | 45 | 0 | 90 | O3 |
| 2023 | 31 | 52 | 0 | 99 | PM2.5 |
| 2024 | 31 | 53 | 1 | 101 | O3 |
| 2025cleanest | 31 | 43 | 0 | 57 | O3 |
What August air means in Stockton
A typical August day in Stockton is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 14 of August days (7.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
August's median AQI of 52 is above Stockton's whole-year median of 48, making it one of the area's dirtier periods. Nationally, the median August AQI across every EPA metro area (104,152 metro-days, 2019–2025) is 45, so Stockton runs above the national August norm; 7.4% of its August days topped AQI 100 versus 3.5% nationally (above average).
August is part of Stockton's summer season (June, July, August); the summer page pools all three months.
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 month 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.