Data: EPA AirNow, FEMA National Risk Index Last verified: 2026-05-03

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. Fresno's average AQI of 58 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: Fresno, 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 Fresno

AQI varies across Fresno's 58 ZIP codes based on proximity to pollution sources and local geography.

ZIP Code	AQI	Category	Wildfire	Mold
93650	58	Moderate	49	33	View report →
93701	58	Moderate	50	38	View report →
93702	58	Moderate	50	41	View report →
93703	58	Moderate	50	41	View report →
93704	58	Moderate	49	47	View report →
93705	58	Moderate	49	41	View report →
93706	58	Moderate	44	38	View report →
93707	58	Moderate	50	18	View report →
93708	58	Moderate	50	18	View report →
93709	58	Moderate	50	18	View report →
93710	58	Moderate	49	36	View report →
93711	58	Moderate	49	35	View report →
93712	58	Moderate	50	18	View report →
93714	58	Moderate	50	18	View report →
93715	58	Moderate	50	18	View report →

Showing 15 of 20 ZIP codes. View all.

Air Quality Overview

Fresno, California has moderate air quality with an average AQI of 58. 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 Fresno

AQI varies across Fresno's 58 ZIP codes based on proximity to pollution sources, traffic patterns, and local geography:

Showing 15 of 58 ZIP codes. Check your specific ZIP for detailed data.

Wildfire Smoke Risk

Fresno has an elevated wildfire smoke risk with an average smoke risk score of 50 (scale 0-100). There have been 1,561 fires recorded within 100 km of city ZIP codes.

Metric	Value
Avg. smoke risk score	50
Max smoke risk score	50
Fires within 100 km	1,561
High-risk ZIP codes	56

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

Fresno has an average mold risk score of 24 out of 100.

Factor	Value
Mold risk score	24/100
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 58), 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

Fresno vs. Nearby California Cities

How Fresno's air quality compares to nearby cities:

ZIP Codes in Fresno

Fresno covers 58 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.