Worst air pollution Sioux City, today and tomorrow
Today (16 July): Air quality in Sioux City is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 36.3/100).
Tomorrow (17 July 2026): Air quality in Sioux City is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 38.8/100). 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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Sioux City's air quality reflects the Missouri River valley's flat Midwest terrain, with vehicle emissions from I-29 and one of the US's largest concentrations of meatpacking facilities contributing elevated ammonia, biological particulates, and industrial PM2.5 alongside the primary vehicle sources. The river valley provides ventilation, while prevailing westerly Plains winds generally maintain moderate levels.
Today - 16 July | Pollution peaks at 12:00
AQI:
Fair
36.3/100
PM2.5 (fine particles):
Good
13.9/100
PM10 (coarse particles):
Good
11.1/100
NO2 (nitrogen dioxide):
Good
11.7/100
O3 (ozone):
Fair
36.3/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.4/100
PM1 (ultrafine particles):
Good
6.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
38.8/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
9.3/100
NO2 (nitrogen dioxide):
Good
12.5/100
O3 (ozone):
Fair
38.8/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.0/100
PM1 (ultrafine particles):
Good
6.8/100
Pollen forecast in Sioux City
View pollen forecastFrequently Asked Questions
Is air quality bad in Sioux City right now?
On 16 July 2026, overall air quality in Sioux City is fair. AQI is the main air quality indicator at 36.3/100. Pollution peaks around 12:00 PM (O3: 36.3/100).
Will air quality be worse tomorrow in Sioux City?
On 17 July 2026, air quality conditions in Sioux City will be similar to today, with AQI forecast at fair at 38.8/100. Pollution peaks around 12:00 PM (O3: 38.8/100).
When is air pollution at its worst in Sioux City?
Sioux City's air quality follows a clear seasonal pattern: the calmest air usually arrives in winter, between planting and harvest dust events, but spring planting and autumn harvest can push particulate levels up with dust and agricultural burning. Wide-open terrain generally helps disperse pollution quickly once the wind picks up.
Are air quality levels in Sioux City 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