Worst air pollution Roskilde, today and tomorrow
Today (4 August): Air quality in Roskilde is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (O3: 29.2/100).
Tomorrow (5 August 2026): Air quality in Roskilde is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 39.4/100). 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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Roskilde's air quality is generally good by Danish standards, with the Roskilde Fjord's consistent Kattegat breezes providing reliable maritime ventilation across this historic Viking capital. Vehicle traffic on the E20 motorway and the Roskilde Festival's annual concentrated event traffic are the primary local sources, while the flat Jutland-Zealand agricultural plain and the fjord's open geometry generally maintain Roskilde among Denmark's more moderate urban environments throughout most of the year.
Today - 4 August | Pollution peaks at 18:00
AQI:
Fair
29.2/100
PM2.5 (fine particles):
Good
9.6/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
11.1/100
O3 (ozone):
Fair
29.2/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
10.8/100
Levels show the poorest local air quality during the day
Tomorrow - 5 August | Pollution peaks at 12:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Good
7.0/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Good
9.3/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.9/100
PM1 (ultrafine particles):
Good
8.5/100
Pollen forecast in Roskilde
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Roskilde
Frequently Asked Questions
Is air quality bad in Roskilde right now?
On 4 August 2026, overall air quality in Roskilde is fair. AQI is the main air quality indicator at 29.2/100. Pollution peaks around 6:00 PM (O3: 29.2/100).
Will air quality be worse tomorrow in Roskilde?
On 5 August 2026, air quality conditions in Roskilde will be similar to today, with AQI forecast at fair at 39.4/100. Pollution peaks around 12:00 PM (O3: 39.4/100).
When is air pollution at its worst in Roskilde?
Roskilde's air quality dips are tied mainly to E20 traffic and, for a few days each year, the concentrated event traffic around the Roskilde Festival. Outside festival season, the fjord's Kattegat breeze keeps conditions at a fairly steady moderate level.
Are air quality levels in Roskilde 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: 4 August 2026 at 16:38 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.
For long term forecasts and maps, see the Airmine app