Worst air pollution St. Peters, today and tomorrow
Today (16 July): Air quality in St. Peters is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 48.6/100).
Tomorrow (17 July 2026): Air quality in St. Peters is fair. 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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St. Peters' air quality reflects the flat Missouri prairie in the St. Louis metropolitan area's St. Charles County, with vehicle emissions from I-70 and the surrounding suburban and commercial corridor contributing local sources. The Missouri River corridor channels prevailing westerly winds, while summer ozone from regional agricultural and vehicle sources across the broader Midwest airshed is the primary warm-season concern and the flat terrain generally allows reasonable dispersal throughout the year.
Today - 16 July | Pollution peaks at 08:00
AQI:
Medium
48.6/100
PM2.5 (fine particles):
Good
18.0/100
PM10 (coarse particles):
Good
16.0/100
NO2 (nitrogen dioxide):
Fair
23.1/100
O3 (ozone):
Medium
48.6/100
SO2 (sulfur dioxide):
Good
4.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.4/100
PM1 (ultrafine particles):
Good
12.6/100
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
18.0/100
PM10 (coarse particles):
Good
11.0/100
NO2 (nitrogen dioxide):
Fair
22.5/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
3.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.8/100
PM1 (ultrafine particles):
Good
11.8/100
Pollen forecast in St. Peters
View pollen forecastFrequently Asked Questions
Is air quality bad in St. Peters right now?
On 16 July 2026, overall air quality in St. Peters is fair. NO2 is the main pollutant at 23.1/100. Pollution peaks around 8:00 AM (O3: 48.6/100).
Will air quality be worse tomorrow in St. Peters?
On 17 July 2026, air quality conditions in St. Peters will be similar to today, with NO2 forecast at fair at 22.5/100. Pollution peaks around 7:00 AM (O3: 51.8/100).
When is air pollution at its worst in St. Peters?
Air quality across St. Peters rises and falls with the seasons, as winter generally brings the cleanest air, aside from brief inversion episodes during calm cold spells; by contrast, 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 St. Peters 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