AIR QUALITY MO

Air Quality in Saint Joseph, MO: Good (50 AQI)

AQI 50 · Good · Ozone · Updated 2026-07-18

Saint Joseph's air quality is good. Air pollution poses little or no risk.

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

Average AQI

Good

AQI Category

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. Saint Joseph's average AQI of 50 falls in the "Good" range.

Air Quality Map: Saint Joseph, MO

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 Saint Joseph

AQI varies across Saint Joseph's 8 ZIP codes based on proximity to pollution sources and local geography.

ZIP Code	AQI	Category	Wildfire	Mold
64501	50	Good	13	59	View report →
64502	50	Good	13	35	View report →
64503	50	Good	13	53	View report →
64504	50	Good	14	62	View report →
64505	50	Good	13	56	View report →
64506	50	Good	13	46	View report →
64507	50	Good	13	56	View report →
64508	50	Good	14	43	View report →

Air Quality Overview

Saint Joseph, Missouri has good air quality with an average AQI of 50. This means air pollution poses little or no risk. The dominant pollutant measured is Ozone.

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: Ozone

Ground-level ozone forms when pollutants from cars, power plants, and industrial facilities react with sunlight. Unlike stratospheric ozone, ground-level ozone is harmful to breathe.

Health effects of ozone exposure:

Irritation of the respiratory system
Reduced lung function
Aggravation of asthma and chronic lung diseases
Increased susceptibility to respiratory infections

Peak times: Ozone levels are typically highest on hot, sunny afternoons. Exercise outdoors in the morning when levels are lower.

Air Quality by ZIP Code in Saint Joseph

AQI varies across Saint Joseph's 8 ZIP codes based on proximity to pollution sources, traffic patterns, and local geography:

ZIP Code	AQI	Category	Wildfire Risk	Mold Score
64501	50	Good	13	59
64502	50	Good	13	35
64503	50	Good	13	53
64504	50	Good	14	62
64505	50	Good	13	56
64506	50	Good	13	46
64507	50	Good	13	56
64508	50	Good	14	43

Wildfire Smoke Risk

Saint Joseph has an elevated wildfire smoke risk with an average smoke risk score of 13 (scale 0-100). There have been 17 fires recorded within 100 km of city ZIP codes.

Metric	Value
Avg. smoke risk score	13
Max smoke risk score	14
Fires within 100 km	17
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

Saint Joseph has an average mold risk score of 51 out of 100, with 4 ZIP codes in the high-risk category.

Factor	Value
Mold risk score	51/100
Average humidity	68% RH
High-risk ZIPs	4
Peak season	summer 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 good air quality (AQI 50), Saint Joseph residents can enjoy outdoor activities without significant restrictions. General tips:

Monitor AQI during wildfire season for temporary spikes
Use HEPA air purifiers indoors if you have respiratory conditions
Maintain indoor humidity between 30-50% to prevent mold

Saint Joseph vs. Nearby Missouri Cities

How Saint Joseph's air quality compares to nearby cities:

City	AQI	Category	Population
Saint Joseph	50	Good	82,702
Saint Peters	55	Moderate	74,876
Saginaw	46	Good	73,728
Joplin	46	Good	73,393

ZIP Codes in Saint Joseph

Saint Joseph covers 8 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 Saint Joseph?

Yes - Saint Joseph's average AQI is 50 (Good). Air pollution poses little or no risk for the general population.

How many unhealthy air days does Saint Joseph have?

Saint Joseph has zero recorded unhealthy air quality days, which is excellent. Air quality can still vary seasonally due to wildfire smoke, pollen, or industrial activity.

What is the AQI in Saint Joseph?

The average Air Quality Index (AQI) in Saint Joseph is 50, categorized as Good. The primary pollutant is Ozone. 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 Saint Joseph?

Saint Joseph has a wildfire risk score of 13 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 Saint Joseph?

Saint Joseph has a mold risk score of 51 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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