Worst air pollution Saint-Ouen, today and tomorrow
Today (20 September): Air quality in Saint-Ouen is fair. AQI, PM2.5, NO2, and PM1 are fair; PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 10:00 AM (NO2: 38.8/100).
Tomorrow (21 September 2026): Air quality in Saint-Ouen is moderate. AQI worsens to moderate; PM10 increases to fair; NO2 increases to moderate; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (NO2: 47.9/100). Airmine updates local air quality forecasts four times daily.
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Saint-Ouen's air quality reflects Greater Paris' northern inner industrial suburb adjacent to the Seine, with the A86 motorway and the Saint-Ouen flea market and surrounding logistics and industrial corridor historically generating elevated NOₓ and PM2.5. The Seine river provides limited ventilation, while the regenerating industrial waterfront and the densely urbanised character maintain consistently elevated readings throughout the year.
Today - 20 September | Pollution peaks at 10:00
AQI:
Fair
38.8/100
PM2.5 (fine particles):
Fair
27.4/100
PM10 (coarse particles):
Good
16.5/100
NO2 (nitrogen dioxide):
Fair
38.8/100
O3 (ozone):
Good
19.2/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
11.8/100
PM1 (ultrafine particles):
Fair
26.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 10:00
AQI:
Moderate
47.9/100
PM2.5 (fine particles):
Fair
29.8/100
PM10 (coarse particles):
Fair
20.7/100
NO2 (nitrogen dioxide):
Moderate
47.9/100
O3 (ozone):
Fair
37.5/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
14.5/100
PM1 (ultrafine particles):
Fair
31.3/100
Pollen forecast in Saint-Ouen
View pollen forecastFrequently Asked Questions
Is air quality bad in Saint-Ouen right now?
On 20 September 2026, overall air quality in Saint-Ouen is fair. AQI is the main air quality indicator at 38.8/100. Pollution peaks around 10:00 AM (NO2: 38.8/100).
Will air quality be worse tomorrow in Saint-Ouen?
On 21 September 2026, air quality conditions in Saint-Ouen will be worse than today, with AQI forecast at moderate at 47.9/100. Pollution peaks around 10:00 AM (NO2: 47.9/100).
When is air pollution at its worst in Saint-Ouen?
The days that hit sensitive groups hardest in Saint-Ouen are calm spring ones, when agricultural traffic and river-valley industry and the oak and plane pollen peak overlap; the wide Loire valley allows steady airflow, so relief usually isn't far behind. The presence of Loire valley cereal farmland and vineyards in the area adds another layer to the local pattern.
Are air quality levels in Saint-Ouen 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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