Highest air pollution Siegen, today and tomorrow
Today (30 June): Air quality in Siegen is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (O3: 39.7/100).
Tomorrow (1 July 2026): Air quality in Siegen is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 7:00 PM (O3: 32.4/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Siegen's air quality reflects the Sieg river valley in the Bergisches Land-Sauerland border, with vehicle traffic on the A45 motorway and the surrounding steel and iron manufacturing legacy of this former Siegerland mining region contributing elevated industrial PM2.5. The enclosed valley topography between the Siegerland hills creates topographic concentration under calm winter conditions, while Atlantic westerlies provide the primary ventilation pathway through the valley corridor.
Today - 30 June | Pollution peaks at 18:00
AQI:
Fair
39.7/100
PM2.5 (fine particles):
Good
14.8/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Fair
23.3/100
O3 (ozone):
Fair
39.7/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.2/100
PM1 (ultrafine particles):
Good
17.5/100
Levels show the poorest local air quality during the day
Tomorrow - 1 July | Pollution peaks at 19:00
AQI:
Fair
32.4/100
PM2.5 (fine particles):
Good
8.5/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
12.1/100
O3 (ozone):
Fair
32.4/100
SO2 (sulfur dioxide):
Good
5.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
8.6/100
Pollen forecast in Siegen
View pollen forecastFrequently Asked Questions
Is air quality bad in Siegen right now?
On 30 June 2026, overall air quality in Siegen is fair. AQI is the main air quality indicator at 39.7/100. Pollution peaks around 6:00 PM (O3: 39.7/100).
Will air quality be worse tomorrow in Siegen?
On 1 July 2026, air quality conditions in Siegen will be similar to today, with AQI forecast at fair at 32.4/100. Pollution peaks around 7:00 PM (O3: 32.4/100).
Are air quality levels in Siegen 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.
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Data provided by Airmine — Last update: 30 June 2026 at 13:02 CET (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.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team