Worst air pollution Umeå, today and tomorrow
Today (20 September): Air quality in Umeå is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (O3: 20.7/100).
Tomorrow (21 September 2026): Air quality in Umeå is good. AQI improves to good; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 17.5/100). 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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Umeå's air quality is excellent by European standards, with clean Arctic and Baltic airflows providing outstanding natural ventilation in this northern Swedish university city. Vehicle traffic on the E12 motorway and wood-burning stoves during the long subarctic winters are the primary local sources, while the surrounding Norrland boreal forest and consistent northerly maritime climate maintain Umeå among Sweden's cleanest major urban environments throughout the year.
Today - 20 September | Pollution peaks at 00:00
AQI:
Fair
20.7/100
PM2.5 (fine particles):
Good
3.7/100
PM10 (coarse particles):
Good
1.9/100
NO2 (nitrogen dioxide):
Good
3.4/100
O3 (ozone):
Fair
20.7/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
0.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 16:00
AQI:
Good
17.5/100
PM2.5 (fine particles):
Good
2.1/100
PM10 (coarse particles):
Good
1.0/100
NO2 (nitrogen dioxide):
Good
2.6/100
O3 (ozone):
Good
17.5/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
0.3/100
Pollen forecast in Umeå
View pollen forecastFrequently Asked Questions
Is air quality bad in Umeå right now?
On 20 September 2026, overall air quality in Umeå is fair. AQI is the main air quality indicator at 20.7/100. Pollution peaks around 12:00 AM (O3: 20.7/100).
Will air quality be worse tomorrow in Umeå?
On 21 September 2026, air quality conditions in Umeå will be better than today, with AQI forecast at good at 17.5/100. Pollution peaks around 4:00 PM (O3: 17.5/100).
When is air pollution at its worst in Umeå?
When is air quality typically worst in Umeå? Midwinter is generally the least favourable period, as still air and cold temperatures allow local pollutants to build up rather than clear. As spring arrives, increasing wind speeds generally help clear the air faster than in the calmer winter months. Summer generally brings the year's best air quality, thanks to longer days, more ventilation, and less need for heating. By October and November, cooling air and calmer evenings start to mirror the patterns that intensify further in winter. The harsher northern winter means these seasonal effects tend to last longer and feel more pronounced than further south.
Are air quality levels in Umeå 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: 20 September 2026 at 14:33 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.
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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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