Worst air pollution Rouen, today and tomorrow
Today (20 September): Air quality in Rouen is fair. AQI and PM2.5 are fair; PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 PM (PM2.5: 29.5/100).
Tomorrow (21 September 2026): Air quality in Rouen is moderate. AQI worsens to moderate; PM2.5 increases to moderate; PM10 increases to fair; NO2 increases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 AM (PM2.5: 40.1/100). Airmine updates local air quality forecasts four times daily.
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Rouen's air quality faces significant industrial challenges from the Seine valley's concentration of refineries, chemical plants, and pharmaceutical manufacturing, with elevated SO₂ and industrial PM2.5 alongside vehicle traffic on the A28. The Seine valley's topographic enclosure concentrates emissions under calm conditions, making Rouen one of northwestern France's more persistently challenged urban industrial environments.
Today - 20 September | Pollution peaks at 20:00
AQI:
Fair
29.5/100
PM2.5 (fine particles):
Fair
29.5/100
PM10 (coarse particles):
Good
19.2/100
NO2 (nitrogen dioxide):
Good
13.0/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
5.4/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 08:00
AQI:
Moderate
40.1/100
PM2.5 (fine particles):
Moderate
40.1/100
PM10 (coarse particles):
Fair
22.4/100
NO2 (nitrogen dioxide):
Fair
20.8/100
O3 (ozone):
Fair
24.7/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
11.6/100
Pollen forecast in Rouen
View pollen forecastFrequently Asked Questions
Is air quality bad in Rouen right now?
On 20 September 2026, overall air quality in Rouen is fair. AQI is the main air quality indicator at 29.5/100. Pollution peaks around 8:00 PM (PM2.5: 29.5/100).
Will air quality be worse tomorrow in Rouen?
On 21 September 2026, air quality conditions in Rouen will be worse than today, with AQI forecast at moderate at 40.1/100. Pollution peaks around 8:00 AM (PM2.5: 40.1/100).
When is air pollution at its worst in Rouen?
Rouen's toughest days for allergy and air quality sufferers alike are usually calm, dry ones when port traffic and cross-Channel shipping overlap with the birch and oak pollen peak; Channel winds provide frequent ventilation, offering fairly regular relief.
Are air quality levels in Rouen 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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