Worst air pollution Forest Park - St. Louis, today and tomorrow
Today (9 August): Air quality in Forest Park is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 32.4/100).
Tomorrow (10 August 2026): Air quality in Forest Park is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 36.0/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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St. Louis' Forest Park air quality benefits from the 1,300-acre historic park's exceptional woodland and open meadow providing outstanding natural filtration, with the park's extraordinary urban green scale providing among the US's most impressive urban park air quality buffering. Vehicle traffic on Lindell Boulevard and the surrounding residential corridors contribute modest local sources, while the park's extensive canopy generally maintains excellent to good conditions in the park interior throughout most of the year.
Today - 9 August | Pollution peaks at 11:00
AQI:
Fair
32.4/100
PM2.5 (fine particles):
Good
8.6/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
1.1/100
O3 (ozone):
Fair
32.4/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.4/100
PM1 (ultrafine particles):
Good
5.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 08:00
AQI:
Fair
36.0/100
PM2.5 (fine particles):
Good
7.7/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
36.0/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
5.0/100
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Frequently Asked Questions
Is air quality bad in Forest Park right now?
On 9 August 2026, overall air quality in Forest Park is fair. AQI is the main air quality indicator at 32.4/100. Pollution peaks around 11:00 AM (O3: 32.4/100).
Will air quality be worse tomorrow in Forest Park?
On 10 August 2026, air quality conditions in Forest Park will be similar to today, with AQI forecast at fair at 36.0/100. Pollution peaks around 8:00 AM (O3: 36.0/100).
When is air pollution at its worst in Forest Park?
Like the rest of St. Louis, Forest Park sees air quality change through the year. Typically, the calmest air usually arrives in winter, between planting and harvest dust events, while spring planting and autumn harvest can push particulate levels up with dust and agricultural burning. Farm-heavy surrounding land is the main source of the seasonal dust spikes.
Are air quality levels in Forest Park based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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