AIR QUALITY CA

Air Quality in Stockton, CA: Moderate (52 AQI)

AQI 52 · Moderate · PM2.5 · Updated 2026-07-18

Stockton's air quality is moderate. Unusually sensitive people should consider reducing prolonged outdoor exertion.

Data: EPA AirNow, FEMA National Risk Index Last verified: 2026-07-18

Average AQI

Moderate

AQI Category

Unhealthy Days

Wildfire Risk

Mold Score

ZIP Codes

What is AQI?

The Air Quality Index (AQI) is a standardized scale from 0 to 500 that measures air pollution levels. 0-50 is "Good," 51-100 is "Moderate," 101-150 is "Unhealthy for Sensitive Groups," and above 150 is "Unhealthy" for everyone. AQI tracks five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Stockton's average AQI of 52 falls in the "Moderate" range.

How do wildfires affect air quality?

Wildfire smoke contains fine particulate matter (PM2.5) that can travel hundreds of miles and dramatically spike AQI readings. During fire season, even cities far from active fires can experience unhealthy air. HEPA air purifiers (rated for PM2.5) are the most effective indoor protection. Check AirNow.gov for real-time conditions during fire season.

Air Quality Map: Stockton, CA

Each dot represents a ZIP code. Color indicates AQI level. Tap a dot for details.

Good (0-50) Moderate (51-100) USG (101-150) Unhealthy (151+)

Air Quality by ZIP Code in Stockton

AQI varies across Stockton's 20 ZIP codes based on proximity to pollution sources and local geography.

ZIP Code	AQI	Category	Wildfire	Mold
95201	52	Moderate	26	25	View report →
95202	52	Moderate	26	54	View report →
95203	52	Moderate	26	46	View report →
95204	52	Moderate	25	49	View report →
95205	52	Moderate	26	43	View report →
95206	52	Moderate	26	29	View report →
95207	52	Moderate	25	38	View report →
95208	52	Moderate	20	25	View report →
95209	52	Moderate	25	34	View report →
95210	52	Moderate	25	31	View report →
95211	52	Moderate	25	29	View report →
95212	52	Moderate	25	25	View report →
95213	52	Moderate	26	29	View report →
95214	52	Moderate	26	29	View report →
95215	52	Moderate	26	46	View report →

Showing 15 of 20 ZIP codes. View all.

Air Quality Overview

Stockton, California has moderate air quality with an average AQI of 52. Air quality is acceptable, though some pollutants may be a concern for a small number of people who are unusually sensitive to air pollution. The dominant pollutant is PM2.5.

The Air Quality Index (AQI) is an EPA-standardized scale from 0 to 500. Values below 50 are "Good," 51-100 "Moderate," 101-150 "Unhealthy for Sensitive Groups," 151-200 "Unhealthy," 201-300 "Very Unhealthy," and above 300 "Hazardous."

Dominant Pollutant: PM2.5

PM2.5 (fine particulate matter) consists of particles smaller than 2.5 micrometers - about 30 times thinner than a human hair. These particles can penetrate deep into the lungs and enter the bloodstream.

Health effects of PM2.5 exposure:

Short-term: coughing, shortness of breath, aggravated asthma
Long-term: reduced lung function, cardiovascular disease, premature death
Most vulnerable: children, elderly, people with heart or lung disease

Common sources in urban areas: vehicle exhaust, construction dust, industrial emissions, wildfire smoke, residential wood burning.

Air Quality by ZIP Code in Stockton

AQI varies across Stockton's 20 ZIP codes based on proximity to pollution sources, traffic patterns, and local geography:

ZIP Code	AQI	Category	Wildfire Risk	Mold Score
95201	52	Moderate	26	25
95202	52	Moderate	26	54
95203	52	Moderate	26	46
95204	52	Moderate	25	49
95205	52	Moderate	26	43
95206	52	Moderate	26	29
95207	52	Moderate	25	38
95208	52	Moderate	20	25
95209	52	Moderate	25	34
95210	52	Moderate	25	31
95211	52	Moderate	25	29
95212	52	Moderate	25	25
95213	52	Moderate	26	29
95214	52	Moderate	26	29
95215	52	Moderate	26	46

Showing 15 of 20 ZIP codes. Check your specific ZIP for detailed data.

Wildfire Smoke Risk

Stockton has an elevated wildfire smoke risk with an average smoke risk score of 25 (scale 0-100). There have been 378 fires recorded within 100 km of city ZIP codes.

Metric	Value
Avg. smoke risk score	25
Max smoke risk score	26
Fires within 100 km	378
High-risk ZIP codes	0

Wildfire smoke contains PM2.5, carbon monoxide, and volatile organic compounds. Even short-term exposure can trigger asthma attacks and respiratory distress.

Indoor Mold Risk

Stockton has an average mold risk score of 34 out of 100.

Factor	Value
Mold risk score	34/100
Average humidity	57% RH
High-risk ZIPs	0
Peak season	winter high

Mold risk is influenced by humidity levels, housing age (older homes have more moisture issues), flood history, and water infrastructure quality. Indoor humidity above 60% creates favorable conditions for mold growth.

Signs of mold problems: musty odors, visible growth on walls or ceilings, worsening allergies indoors, condensation on windows. Professional mold testing ($300-$600) can identify hidden issues.

Health Recommendations

With moderate air quality (AQI 52), most people can be active outdoors. Sensitive groups should take precautions:

Sensitive groups (asthma, COPD, heart disease): consider reducing prolonged outdoor exertion
Keep windows closed on high-pollution days
Use a HEPA air purifier in main living areas
Check AirNow.gov before outdoor exercise

Stockton vs. Nearby California Cities

How Stockton's air quality compares to nearby cities:

City	AQI	Category	Population
Stockton	52	Moderate	388,283
Anaheim	75	Moderate	361,314
Oakland	56	Moderate	425,492
Santa Ana	49	Good	335,987

ZIP Codes in Stockton

Stockton covers 20 ZIP codes. Air quality can vary by neighborhood based on proximity to highways, industrial areas, and green spaces. Check your specific ZIP code for localized data.

Data Sources

Air quality: EPA AirNow - real-time and historical AQI data
Wildfire risk: FEMA National Risk Index
Mold risk: Derived from EPA, FEMA, Census ACS (humidity, housing age, flood history)
Monthly AQI: EPA Air Quality Statistics

Updated daily.

Frequently Asked Questions

Is the air safe to breathe in Stockton?

Stockton's average AQI is 52 (Moderate). Air quality is acceptable, but unusually sensitive individuals may experience respiratory symptoms during peak pollution times.

How many unhealthy air days does Stockton have?

Stockton experiences 20 unhealthy air quality days per year on average. During these days, everyone - not just sensitive groups - should reduce prolonged outdoor exertion.

What is the AQI in Stockton?

The average Air Quality Index (AQI) in Stockton is 52, categorized as Moderate. The primary pollutant is PM2.5. AQI ranges from 0-500, where 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and 151+ Unhealthy.

What is the wildfire risk in Stockton?

Stockton has a wildfire risk score of 25 out of 100. Low wildfire risk means smoke events are uncommon, but regional fires can still temporarily affect air quality.

Is mold a concern in Stockton?

Stockton has a mold risk score of 34 out of 100, based on humidity, precipitation, and temperature data. Maintain good ventilation and address any water intrusion promptly to prevent mold growth.

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