AIR QUALITY WI

Air Quality in Green Bay, WI: Good (42 AQI)

AQI 42 · Good · Ozone · Updated 2026-05-03

Green Bay's air quality is good. Air pollution poses little or no risk.

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

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. Green Bay's average AQI of 42 falls in the "Good" range.

Air Quality Map: Green Bay, WI

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 Green Bay

AQI varies across Green Bay's 12 ZIP codes based on proximity to pollution sources and local geography.

ZIP Code	AQI	Category	Wildfire	Mold
54301	42	Good	12	68	View report →
54302	42	Good	11	60	View report →
54303	42	Good	12	65	View report →
54304	42	Good	12	54	View report →
54305	42	Good	12	43	View report →
54306	42	Good	11	43	View report →
54307	42	Good	12	47	View report →
54308	42	Good	11	43	View report →
54311	42	Good	11	48	View report →
54313	42	Good	12	45	View report →
54324	42	Good	12	43	View report →
54344	42	Good	12	43	View report →

Air Quality Overview

Green Bay, Wisconsin has good air quality with an average AQI of 42. 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 Green Bay

AQI varies across Green Bay's 12 ZIP codes based on proximity to pollution sources, traffic patterns, and local geography:

ZIP Code	AQI	Category	Wildfire Risk	Mold Score
54301	42	Good	12	68
54302	42	Good	11	60
54303	42	Good	12	65
54304	42	Good	12	54
54305	42	Good	12	43
54306	42	Good	11	43
54307	42	Good	12	47
54308	42	Good	11	43
54311	42	Good	11	48
54313	42	Good	12	45
54324	42	Good	12	43
54344	42	Good	12	43

Wildfire Smoke Risk

Green Bay has an elevated wildfire smoke risk with an average smoke risk score of 12 (scale 0-100). There have been 57 fires recorded within 100 km of city ZIP codes.

Metric	Value
Avg. smoke risk score	12
Max smoke risk score	12
Fires within 100 km	57
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

Green Bay has an average mold risk score of 50 out of 100, with 3 ZIP codes in the high-risk category.

Factor	Value
Mold risk score	50/100
Average humidity	70% RH
High-risk ZIPs	3
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 42), Green Bay 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

Green Bay vs. Nearby Wisconsin Cities

How Green Bay's air quality compares to nearby cities:

City	AQI	Category	Population
Green Bay	42	Good	177,103
Racine	83	Moderate	128,750
Oneida	69	Moderate	107,369
Kenosha	83	Moderate	99,743

ZIP Codes in Green Bay

Green Bay covers 12 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 Green Bay?

Yes — Green Bay's average AQI is 42 (Good). Air pollution poses little or no risk for the general population.

How many unhealthy air days does Green Bay have?

Green Bay 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 Green Bay?

The average Air Quality Index (AQI) in Green Bay is 42, 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 Green Bay?

Green Bay has a wildfire risk score of 12 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 Green Bay?

Green Bay has a mold risk score of 50 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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