Worst air pollution Marshalltown, today and tomorrow
Today (9 August): Air quality in Marshalltown is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (NO2: 40.1/100).
Tomorrow (10 August 2026): Air quality in Marshalltown is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 58.7/100). 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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In Marshalltown, open central Iowa farmland air is the main influence on air quality, and fall ragweed pollen is the year's sharpest spike. That mix of factors is fairly representative of towns in this part of the country. Local topography and prevailing winds both play a role in how quickly conditions change.
Today - 9 August | Pollution peaks at 00:00
AQI:
Medium
40.1/100
PM2.5 (fine particles):
Good
12.2/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Medium
40.1/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
5.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.0/100
PM1 (ultrafine particles):
Good
14.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Medium
58.7/100
PM2.5 (fine particles):
Good
14.2/100
PM10 (coarse particles):
Good
7.8/100
NO2 (nitrogen dioxide):
Medium
58.7/100
O3 (ozone):
Fair
34.7/100
SO2 (sulfur dioxide):
Good
7.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.7/100
PM1 (ultrafine particles):
Good
9.7/100
Pollen forecast in Marshalltown
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Marshalltown
Frequently Asked Questions
Is air quality bad in Marshalltown right now?
On 9 August 2026, overall air quality in Marshalltown is fair. O3 is the main pollutant at 32.8/100. Pollution peaks around 12:00 AM (NO2: 40.1/100).
Will air quality be worse tomorrow in Marshalltown?
On 10 August 2026, air quality conditions in Marshalltown will be similar to today, with O3 forecast at fair at 34.7/100. Pollution peaks around 11:00 PM (NO2: 58.7/100).
When is air pollution at its worst in Marshalltown?
Marshalltown's air quality has a clear seasonal rhythm. Typically, winter generally brings the cleanest air, aside from brief inversion episodes during calm cold spells, while strong spring winds can raise dust suddenly, and summer heat adds its own ozone risk on top. Wide-open terrain generally helps disperse pollution quickly once the wind picks up.
Are air quality levels in Marshalltown 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: 9 August 2026 at 20:27 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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