Worst air pollution Vallentuna, today and tomorrow
Today (20 September): Air quality in Vallentuna is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 AM (O3: 17.4/100).
Tomorrow (21 September 2026): Air quality in Vallentuna is good. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 15.0/100). Airmine updates local air quality forecasts four times daily.
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Vallentuna's air quality readings are typically favourable, with only isolated periods of elevated pollutant levels. Local sources are dominated by commuter residential and agriculture and everyday vehicle traffic rather than any single major industrial emitter. The Roslagen forest and lake district provides a degree of natural ventilation, preventing pollutants from settling for extended stretches. All told, Vallentuna's air quality profile is fairly typical for a Swedish town of its size and setting.
Today - 20 September | Pollution peaks at 02:00
AQI:
Good
17.4/100
PM2.5 (fine particles):
Good
14.9/100
PM10 (coarse particles):
Good
10.4/100
NO2 (nitrogen dioxide):
Good
4.8/100
O3 (ozone):
Good
17.4/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
0.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 15:00
AQI:
Good
15.0/100
PM2.5 (fine particles):
Good
4.3/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
6.2/100
O3 (ozone):
Good
15.0/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
0.5/100
Pollen forecast in Vallentuna
View pollen forecastFrequently Asked Questions
Is air quality bad in Vallentuna right now?
On 20 September 2026, overall air quality in Vallentuna is good. AQI is the main air quality indicator at 17.4/100. Pollution peaks around 2:00 AM (O3: 17.4/100).
Will air quality be worse tomorrow in Vallentuna?
On 21 September 2026, air quality conditions in Vallentuna will be similar to today, with AQI forecast at good at 15.0/100. Pollution peaks around 3:00 PM (O3: 15.0/100).
When is air pollution at its worst in Vallentuna?
What is the yearly air quality pattern like in Vallentuna? Winter is generally when local emissions build up most, since cold, stagnant air limits how quickly wood-smoke and exhaust clear. From spring onward, increasing wind and precipitation generally break up the stagnant conditions that caused winter dips. Summer typically brings the calmest air quality picture, punctuated only rarely by ozone build-up during still, hot weather. Autumn generally marks the year's decline back toward winter conditions, driven mainly by the return of wood-burning and stiller air. This pattern reflects a fairly classic central Swedish climate, with clear seasonal transitions.
Are air quality levels in Vallentuna 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 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.
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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