Metro area air quality · 2025
Stockton-Lodi, CA
Median AQI 46 (Good). 60.0% of monitored days rated Good across this metro's EPA monitoring network.
- 46
- Median AQI
- 60.0%
- Good-air days
- 0
- Unhealthy days
- 25%
- Cleaner than US metros
Stockton-Lodi, CA posted a 2025 median AQI of 46 (Good) with 60.0% Good days
According to the U.S. EPA Air Quality System, the Stockton-Lodi, CA CBSA recorded a median AQI of 46 across 365 monitored days in 2025, with 60.0% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The Stockton-Lodi, CA CBSA's 60.0% Good-day share places it cleaner than 25% of US metros in 2025.
- Closest median-AQI peer
- Albany, GA (57.3% Good, median AQI 46) is the closest nationwide median-AQI peer to Stockton-Lodi, CA.
- 2020–2025 Good-day shift
- Stockton-Lodi, CA's Good-day share moved +13.4 points from 2020 to 2025 (median AQI -8).
- Median AQI
- Median AQI: 46
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
Stockton-Lodi, CA lands in the lower Good-day tercile (60.0% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 46 and 60.0% of 365 monitored days in the Good band.
- 46
- median AQI · Good
- 60.0%
- days rated Good
- 25%
- cleaner than US metros
- 93
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Stockton-Lodi, CA metro's Good-day share rose from 50.1% to 60.0% between the 2024 and 2025 EPA annual releases, a change of +9.9 percentage points.
- Stockton-Lodi, CA metro's peak single-day AQI fell from 140 to 93 between the 2024 and 2025 EPA annual releases, a change of -47 points.
- Stockton-Lodi, CA metro's median AQI fell from 51 to 46 between the 2024 and 2025 EPA annual releases, a change of -5 points.
Stockton-Lodi, CA lands in the lower Good-day tercile (60.0% Good), a thinner clean-air share than most CBSA peers here. Signature read: 60.0% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 46 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 219 Good (60%), 146 Moderate (40%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 67; the highest single-day reading hit 93 (Moderate).
Across 2020–2025, Good-day share shifted +13.4 points and median AQI moved -8 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Albany, GA (57.3% good, AQI 46); Athens-Clarke County, GA (57.8% good, AQI 46); Brookings, SD (58.6% good, AQI 46).
Air Quality Summary
Median AQI
46
Good
Good Days
60.0%
219 of 365 days
Max AQI
93
Moderate
Health Grade
Moderate
90th pct: 67
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
219
60%
Moderate
146
40%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Stockton-Lodi, CA metro area's air quality is rated Moderate based on 60.0% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Stockton-Lodi, CA metro compare?
How Stockton-Lodi, CA compares
5-Year Air Quality Trend
Air quality is improving in the Stockton-Lodi, CA metro. Highest Good-day share: 2025 (60.0%, 219 of 365 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 162 | 173 | 13 | 54 | 215 |
| 2021 | 140 | 209 | 1 | 55 | 153 |
| 2022 | 192 | 164 | 0 | 48 | 208 |
| 2023 | 208 | 148 | 0 | 47 | 119 |
| 2024 | 178 | 177 | 0 | 51 | 140 |
| 2025 | 219 | 146 | 0 | 46 | 93 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Stockton-Lodi, CA (46).
Albany, GA
Median AQI 46 · 57.3% Good-day share
Athens-Clarke County, GA
Median AQI 46 · 57.8% Good-day share
Brookings, SD
Median AQI 46 · 58.6% Good-day share
Chico, CA
Median AQI 46 · 65.2% Good-day share
Colorado Springs, CO
Median AQI 46 · 68.2% Good-day share
Davenport-Moline-Rock Island, IA-IL
Median AQI 46 · 56.7% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Stockton-Lodi, CA's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Albany-Schenectady-Troy, NY
0 unhealthy-or-worse days · median AQI 41
Frequently Asked Questions
How many unhealthy air days does Stockton-Lodi, CA have? ▼
What is the air quality in the Stockton-Lodi, CA metro area? ▼
Is air quality in Stockton-Lodi, CA getting better or worse? ▼
What does AQI 46 mean for health? ▼
How does Stockton-Lodi, CA compare to other metro areas? ▼
What is the 90th percentile AQI for Stockton-Lodi, CA? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Stockton-Lodi, CA, 2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Stockton-Lodi, CA · 2020–2025