Worst air pollution Norrtälje, today and tomorrow
Today (30 August): Air quality in Norrtälje is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 30.7/100).
Tomorrow (31 August 2026): Air quality in Norrtälje is fair. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 27.4/100). Airmine updates local air quality forecasts four times daily.
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Overall, Norrtälje maintains air quality that compares well with Swedish and wider European norms. Tourism and forestry represents the area's most notable emission source, alongside routine road traffic through the centre. The natural airflow associated with the Roslagen archipelago works in the area's favour for keeping pollutant levels down. All told, Norrtälje's air quality profile is fairly typical for a Swedish town of its size and setting.
Today - 30 August | Pollution peaks at 15:00
AQI:
Fair
30.7/100
PM2.5 (fine particles):
Good
11.1/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Fair
20.4/100
O3 (ozone):
Fair
30.7/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
9.5/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 17:00
AQI:
Fair
27.4/100
PM2.5 (fine particles):
Good
4.2/100
PM10 (coarse particles):
Good
1.4/100
NO2 (nitrogen dioxide):
Fair
24.7/100
O3 (ozone):
Fair
27.4/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
3.9/100
Pollen forecast in Norrtälje
View pollen forecastFrequently Asked Questions
Is air quality bad in Norrtälje right now?
On 30 August 2026, overall air quality in Norrtälje is fair. AQI is the main air quality indicator at 30.7/100. Pollution peaks around 3:00 PM (O3: 30.7/100).
Will air quality be worse tomorrow in Norrtälje?
On 31 August 2026, air quality conditions in Norrtälje will be similar to today, with AQI forecast at fair at 27.4/100. Pollution peaks around 5:00 PM (O3: 27.4/100).
When is air pollution at its worst in Norrtälje?
What is the yearly air quality pattern like in Norrtälje? Air quality is typically at its weakest in December and January, when cold, calm, high-pressure spells let wood-smoke and traffic exhaust settle close to the ground instead of dispersing. From spring onward, increasing wind and precipitation generally break up the stagnant conditions that caused winter dips. Most of the year's best readings occur in summer, with only rare hot, calm days causing a temporary rise in ground-level ozone. By late autumn, the return of heating season and stiller nights start bringing back the kind of conditions seen in winter. The seasonal swing here is fairly pronounced, typical of central Swedish towns away from the immediate coast.
Are air quality levels in Norrtälje 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: 30 August 2026 at 20:26 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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