Worst air pollution Norrtälje, today and tomorrow

On 16 July 2026, overall air quality in Norrtälje is fair. AQI is the main air quality indicator at 32.2/100. Pollution peaks around 1:00 AM (NO2: 32.2/100).

On 17 July 2026, air quality conditions in Norrtälje will be similar to today, with AQI forecast at fair at 33.7/100. Pollution peaks around 5:00 PM (O3: 33.7/100).

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.

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.