Worst air pollution Liège, today and tomorrow
Today (17 August): Air quality in Liège is fair. NO2 and O3 are fair; AQI, PM2.5, and PM1 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 7:00 AM (PM1: 46.2/100).
Tomorrow (18 August 2026): Air quality in Liège is fair. All pollutants stay as today. Pollution peaks around 6:00 AM (PM1: 45.3/100). Airmine updates local air quality forecasts four times daily.
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Liège's air quality reflects its position in the Meuse valley at the heart of Belgium's former industrial heartland, with the legacy Arcelor steel operations and the surrounding chemical and metal manufacturing industry generating elevated industrial emissions alongside vehicle traffic on the E25 and E40 motorways. The Meuse valley's topographic enclosure between the Ardennes and the Hesbaye plateau concentrates industrial and vehicle emissions under frequent temperature inversions in this historic Walloon industrial city.
Today - 17 August | Pollution peaks at 07:00
AQI:
Medium
46.2/100
PM2.5 (fine particles):
Medium
42.7/100
PM10 (coarse particles):
Good
14.9/100
NO2 (nitrogen dioxide):
Fair
38.5/100
O3 (ozone):
Fair
26.3/100
SO2 (sulfur dioxide):
Good
4.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.6/100
PM1 (ultrafine particles):
Medium
46.2/100
Levels show the poorest local air quality during the day
Tomorrow - 18 August | Pollution peaks at 06:00
AQI:
Medium
45.3/100
PM2.5 (fine particles):
Medium
42.0/100
PM10 (coarse particles):
Good
14.0/100
NO2 (nitrogen dioxide):
Fair
38.2/100
O3 (ozone):
Fair
20.2/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
12.8/100
PM1 (ultrafine particles):
Medium
45.3/100
Pollen forecast in Liège
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Frequently Asked Questions
Is air quality bad in Liège right now?
On 17 August 2026, overall air quality in Liège is fair. NO2 is the main pollutant at 38.5/100. Pollution peaks around 7:00 AM (PM1: 46.2/100).
Will air quality be worse tomorrow in Liège?
On 18 August 2026, air quality conditions in Liège will be similar to today, with NO2 forecast at fair at 38.2/100. Pollution peaks around 6:00 AM (PM1: 45.3/100).
When is air pollution at its worst in Liège?
In Liège, reduced air quality is most noticeable when oak and linden pollen peaks, and on days affected by the legacy Arcelor steel operations and the local chemical and metal manufacturing industry; the clearest air tends to follow a change in wind direction or rainfall here.
Are air quality levels in Liège 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: 17 August 2026 at 20:32 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.
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