Stockton Air Quality in February
Across 2019–2025, Stockton's February air quality had a median AQI of 52 (Moderate) over 198 monitored days in the Stockton-Lodi, CA area. 2.0% of February days (4 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 69.7% of days. The cleanest February on record here was 2019 (median AQI 41, 0 days above 100) and the worst was 2022 (median 68, 2 days above 100, peak AQI 109).
- Good: 48.0%
- Moderate: 50.0%
- Unhealthy for Sensitive Groups: 2.0%
- 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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Stockton in February?
Moderate on a typical day: median AQI 52 across 2019–2025, with 2.0% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓48.0% of February days were Good (AQI 0–50), 50.0% Moderate (51–100).
- ✓4 days of 198 reached AQI 101+; the February peak was 114.
- ✓Best February: 2019; worst February: 2022.
Frequently asked questions
What is the air quality like in Stockton in February?▾
Across 2019–2025, the median daily AQI in Stockton in February was 52 (Moderate). 48.0% of days were Good, 50.0% Moderate, and 2.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Stockton?▾
A typical February 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 50 of February days (2.0%) 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 February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 69.7% of February days in Stockton. The highest February AQI recorded in 2019–2025 was 114 (Unhealthy for Sensitive Groups), in 2022.
Stockton February air quality, year by year
Stockton February air quality by year (Stockton-Lodi, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 28 | 41 | 0 | 75 | O3 |
| 2020 | 29 | 63 | 0 | 97 | PM2.5 |
| 2021 | 28 | 54 | 0 | 96 | PM2.5 |
| 2022worst | 28 | 68 | 2 | 109 | PM2.5 |
| 2023 | 28 | 59 | 2 | 114 | PM2.5 |
| 2024 | 29 | 44 | 0 | 86 | PM2.5 |
| 2025 | 28 | 43 | 0 | 78 | PM2.5 |
What February air means in Stockton
A typical February 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 50 of February days (2.0%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
February'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 February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Stockton runs above the national February norm; 2.0% of its February days topped AQI 100 versus 0.4% nationally (above average).
February is part of Stockton's winter season (December, January, February); the winter 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.