Stockton Air Quality in Spring
Across 2019–2025, Stockton's spring (March–May) air quality had a median AQI of 42 (Good) over 644 monitored days in the Stockton-Lodi, CA area. 0.3% of spring days (2 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.7% of days. The cleanest spring on record here was 2020 (median AQI 39, 0 days above 100) and the worst was 2021 (median 47, 1 day above 100, peak AQI 104).
- Good: 78.9%
- Moderate: 20.8%
- Unhealthy for Sensitive Groups: 0.3%
- 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 spring?
Good on a typical day: median AQI 42 across 2019–2025, with 0.3% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓78.9% of spring days were Good (AQI 0–50), 20.8% Moderate (51–100).
- ✓2 days of 644 reached AQI 101+; the spring peak was 119.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Stockton in spring?▾
Across 2019–2025, the median daily AQI in Stockton in spring was 42 (Good). 78.9% of days were Good, 20.8% Moderate, and 0.3% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Stockton?▾
A typical spring day in Stockton sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Stockton's spring air quality problems?▾
Ground-level ozone set the daily AQI on 65.7% of spring days in Stockton. The highest spring AQI recorded in 2019–2025 was 119 (Unhealthy for Sensitive Groups), in 2021.
Stockton spring air quality, year by year
Stockton spring air quality by year (Stockton-Lodi, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 43 | 0 | 84 | O3 |
| 2020cleanest | 92 | 39 | 0 | 69 | O3 |
| 2021worst | 92 | 47 | 1 | 104 | PM2.5 |
| 2022 | 92 | 42 | 0 | 100 | O3 |
| 2023 | 92 | 41 | 1 | 119 | O3 |
| 2024 | 92 | 42 | 0 | 61 | O3 |
| 2025 | 92 | 44 | 0 | 62 | O3 |
What spring air means in Stockton
A typical spring day in Stockton sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 42 is below Stockton's whole-year median of 48, making it one of the area's cleaner periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Stockton runs in line with the national Spring norm; 0.3% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, March is the cleanest month (median AQI 40, 0.0% of days above 100) and May the worst (median 44, 0.5% above 100).
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 season 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.