Stockton Air Quality in March
Across 2019–2025, Stockton's March air quality had a median AQI of 40 (Good) over 217 monitored days in the Stockton-Lodi, CA area. 0.0% of March days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 60.8% of days. The cleanest March on record here was 2020 (median AQI 37, 0 days above 100) and the worst was 2025 (median 42, 0 days above 100, peak AQI 62).
- Good: 81.1%
- Moderate: 18.9%
- 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 is the air in Stockton in March?
Good on a typical day: median AQI 40 across 2019–2025, with 0.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓81.1% of March days were Good (AQI 0–50), 18.9% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the March peak was 73.
- ✓Best March: 2020; worst March: 2025.
Frequently asked questions
What is the air quality like in Stockton in March?▾
Across 2019–2025, the median daily AQI in Stockton in March was 40 (Good). 81.1% of days were Good, 18.9% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Stockton?▾
A typical March day in Stockton sits in the Good range (median AQI 40), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Stockton's March air quality problems?▾
Ground-level ozone set the daily AQI on 60.8% of March days in Stockton. The highest March AQI recorded in 2019–2025 was 73 (Moderate), in 2025.
Stockton March air quality, year by year
Stockton March 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 | 41 | 0 | 72 | O3 |
| 2020cleanest | 31 | 37 | 0 | 69 | O3 |
| 2021 | 31 | 41 | 0 | 67 | O3 |
| 2022 | 31 | 41 | 0 | 59 | O3 |
| 2023 | 31 | 39 | 0 | 73 | O3 |
| 2024 | 31 | 37 | 0 | 56 | O3 |
| 2025worst | 31 | 42 | 0 | 62 | O3 |
What March air means in Stockton
A typical March day in Stockton sits in the Good range (median AQI 40), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 40 is below Stockton's whole-year median of 48, making it one of the area's cleaner periods. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Stockton runs in line with the national March norm; 0.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Stockton's spring season (March, April, May); the spring 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.