Marine on St. Croix, Minnesota Air Quality
Marine on St. Croix has a median AQI of 37, earning an air quality grade of A — excellent air quality that ranks better than 74% of US cities. Air quality has remained relatively stable over the past decade. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Marine on St. Croix recorded 110 good air quality days (91% of monitored days).
Population: 740 • County: Washington
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Quick Facts
| Current AQI | 12 — Good |
| Air Quality Grade | A |
| Median AQI (2025) | 37 |
| vs. U.S. Cities | Better than 74% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | → Stable |
| Data Source | EPA AirNow |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Marine on St. Croix Air Quality
What is the air quality in Marine on St. Croix today?
The current AQI in Marine on St. Croix is 12, which is rated "Good". Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Marine on St. Croix getting better or worse?
Air quality in Marine on St. Croix has remained relatively stable over the past decade, with a median AQI of around 37.
What is the most common air pollutant in Marine on St. Croix?
Ozone is the primary air pollutant in Marine on St. Croix, responsible for the most air quality-impacted days in 2025. Ground-level ozone forms when sunlight reacts with vehicle and industrial emissions on warm days.
How many unhealthy air days does Marine on St. Croix have per year?
In 2025, Marine on St. Croix had 0 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 110 good days and 11 moderate days out of 121 days monitored.
What air quality grade does Marine on St. Croix receive?
Marine on St. Croix receives an air quality grade of A, placing it better than 74% of US cities. This grade is based on a median AQI of 37 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 74% of US cities
Nearby Cities
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National Rankings
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Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Marine on St. Croix
Based on your area's air quality (median AQI: 37), we recommend these air purifiers to help protect your health indoors.
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Molekule Air Pro
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Dyson Pure Cool TP04
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