Worst air pollution Florissant, today and tomorrow
Today (16 July): Air quality in Florissant is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 48.6/100).
Tomorrow (17 July 2026): Air quality in Florissant is medium. All pollutants stay as today. Pollution peaks around 7:00 AM (O3: 51.8/100). 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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Florissant's air quality reflects the flat Missouri suburban corridor north of St. Louis, with vehicle emissions from I-270 and the surrounding suburban residential and commercial character contributing local sources. The broader St. Louis metropolitan regional ozone from vehicle and industrial sources is the primary warm-season concern, while the flat Missouri terrain provides generally good wind dispersal and the suburban character generally maintains moderate Midwest metropolitan suburban readings throughout the year.
Today - 16 July | Pollution peaks at 08:00
AQI:
Medium
48.6/100
PM2.5 (fine particles):
Good
14.7/100
PM10 (coarse particles):
Good
13.1/100
NO2 (nitrogen dioxide):
Good
10.1/100
O3 (ozone):
Medium
48.6/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.4/100
PM1 (ultrafine particles):
Good
10.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 07:00
AQI:
Medium
51.8/100
PM2.5 (fine particles):
Good
14.8/100
PM10 (coarse particles):
Good
9.0/100
NO2 (nitrogen dioxide):
Good
9.7/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.8/100
PM1 (ultrafine particles):
Good
9.7/100
Pollen forecast in Florissant
View pollen forecastFrequently Asked Questions
Is air quality bad in Florissant right now?
On 16 July 2026, overall air quality in Florissant is medium. AQI is the main air quality indicator at 48.6/100. Pollution peaks around 8:00 AM (O3: 48.6/100).
Will air quality be worse tomorrow in Florissant?
On 17 July 2026, air quality conditions in Florissant will be similar to today, with AQI forecast at medium at 51.8/100. Pollution peaks around 7:00 AM (O3: 51.8/100).
When is air pollution at its worst in Florissant?
Florissant's air quality has a clear seasonal rhythm — once the harvest dust settles, winter typically offers the cleanest stretch of the year, whereas both spring planting and autumn harvest bring short bursts of elevated dust and smoke. Farm-heavy surrounding land is the main source of the seasonal dust spikes.
Are air quality levels in Florissant 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app