St. Augustine, Illinois Air Quality
Real-time air quality index (AQI) and pollution data
Population: 92 • County: Knox
Current AQI
Quick Facts
| Current AQI | 99 — Moderate |
| Air Quality Grade | N/A |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for St. Augustine is sourced from the PEORIA_J monitoring area, located approximately 43 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
St. Augustine has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
Frequently Asked Questions About St. Augustine Air Quality
What is the air quality in St. Augustine today?
The current AQI in St. Augustine is 99, rated "Moderate". Air quality is moderate — unusually sensitive individuals may want to limit prolonged outdoor exertion. Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Air Quality Grade
Better than 0% of US cities
Nearby Cities
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National Rankings
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