Worst air pollution Hønefoss, today and tomorrow
Today (20 September): Air quality in Hønefoss is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 17.3/100).
Tomorrow (21 September 2026): Air quality in Hønefoss is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 28.7/100). Airmine updates local air quality forecasts four times daily.
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Hønefoss's air quality reflects the Begna and Randselva river confluence position in Ringerike, with vehicle traffic on the RV35 and surrounding manufacturing, paper, and logistics operations contributing local sources. The Tyrifjord lake breezes and the river valley corridor provide ventilation, while winter inversions in the enclosed valley can concentrate vehicle and heating emissions and the surrounding Nordmarka forest provides clean-air buffering throughout most of the year.
Today - 20 September | Pollution peaks at 23:00
AQI:
Good
17.3/100
PM2.5 (fine particles):
Good
2.2/100
PM10 (coarse particles):
Good
1.1/100
NO2 (nitrogen dioxide):
Good
11.9/100
O3 (ozone):
Good
17.3/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Good
0.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 23:00
AQI:
Fair
28.7/100
PM2.5 (fine particles):
Good
10.9/100
PM10 (coarse particles):
Good
5.0/100
NO2 (nitrogen dioxide):
Fair
28.7/100
O3 (ozone):
Good
17.7/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
3.2/100
Pollen forecast in Hønefoss
View pollen forecastFrequently Asked Questions
Is air quality bad in Hønefoss right now?
On 20 September 2026, overall air quality in Hønefoss is good. AQI is the main air quality indicator at 17.3/100. Pollution peaks around 11:00 PM (O3: 17.3/100).
Will air quality be worse tomorrow in Hønefoss?
On 21 September 2026, air quality conditions in Hønefoss will be worse than today, with AQI forecast at fair at 28.7/100. Pollution peaks around 11:00 PM (NO2: 28.7/100).
When is air pollution at its worst in Hønefoss?
Hønefoss typically sees the sharpest drop in air quality when temperature inversions settle in overnight, when temperature inversions over the flat farmland trap local emissions close to the ground. This part of eastern Norway generally sees decent background air quality overall. Apart from these spells, Hønefoss generally enjoys favourable air quality.
Are air quality levels in Hønefoss 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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