Worst air pollution Sint-Niklaas, today and tomorrow
Today (9 August): Air quality in Sint-Niklaas is medium. AQI, NO2, and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 57.9/100).
Tomorrow (10 August 2026): Air quality in Sint-Niklaas is fair. O3 increases to fair; all other pollutants stay as today. Pollution peaks around 7:00 AM (NO2: 41.0/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Positioned on the Flemish lowland plain, Sint-Niklaas experiences air quality shaped chiefly by vehicle traffic and light industry across the plain. The Oost-Vlaanderen terrain plays a role in how pollutants move through the area, with breezier conditions typically dispersing emissions faster than the still, settled spells that let them accumulate.
Today - 9 August | Pollution peaks at 15:00
AQI:
Medium
57.9/100
PM2.5 (fine particles):
Good
12.7/100
PM10 (coarse particles):
Good
6.0/100
NO2 (nitrogen dioxide):
Medium
53.0/100
O3 (ozone):
Medium
57.9/100
SO2 (sulfur dioxide):
Good
19.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.7/100
PM1 (ultrafine particles):
Good
17.0/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 07:00
AQI:
Medium
41.0/100
PM2.5 (fine particles):
Good
13.1/100
PM10 (coarse particles):
Good
4.9/100
NO2 (nitrogen dioxide):
Medium
41.0/100
O3 (ozone):
Fair
24.3/100
SO2 (sulfur dioxide):
Good
10.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
12.3/100
Pollen forecast in Sint-Niklaas
View pollen forecastFrequently Asked Questions
Is air quality bad in Sint-Niklaas right now?
On 9 August 2026, overall air quality in Sint-Niklaas is medium. AQI is the main air quality indicator at 57.9/100. Pollution peaks around 3:00 PM (O3: 57.9/100).
Will air quality be worse tomorrow in Sint-Niklaas?
On 10 August 2026, air quality conditions in Sint-Niklaas will be worse than today, with O3 forecast at fair at 24.3/100. Pollution peaks around 7:00 AM (NO2: 41.0/100).
When is air pollution at its worst in Sint-Niklaas?
The clearest dips in Sint-Niklaas's air quality track birch and plane pollen peaks and periods of vehicle traffic and light industry across the plain; the rest of the year typically brings clearer, more consistent conditions for the Oost-Vlaanderen area, particularly once autumn winds set in and the local terrain ventilates more easily than during calmer stretches.
Are air quality levels in Sint-Niklaas 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.
Want to see air quality forecasts for other cities in Belgium?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Get the full experience in the Airmine app.