Worst air pollution Saint-Denis, today and tomorrow
Today (16 July): Air quality in Saint-Denis is poor. AQI and O3 are poor; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 63.6/100).
Tomorrow (17 July 2026): Air quality in Saint-Denis is fair. AQI improves to medium; O3 decreases to medium; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 59.7/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Saint-Denis' air quality reflects Greater Paris' northern industrial inner suburbs, with the A1 motorway and surrounding industrial operations historically making this one of France's most polluted urban areas. Vehicle and freight traffic generate sustained NO₂, while the flat Seine plain's limited natural dispersal barriers keep readings consistently among the highest in the greater Paris metropolitan area.
Today - 16 July | Pollution peaks at 16:00
AQI:
Poor
63.6/100
PM2.5 (fine particles):
Good
13.9/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
7.9/100
O3 (ozone):
Poor
63.6/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
15.1/100
PM1 (ultrafine particles):
Good
18.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Medium
59.7/100
PM2.5 (fine particles):
Good
17.2/100
PM10 (coarse particles):
Good
4.8/100
NO2 (nitrogen dioxide):
Good
9.9/100
O3 (ozone):
Medium
59.7/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
19.0/100
PM1 (ultrafine particles):
Fair
22.6/100
Pollen forecast in Saint-Denis
View pollen forecastFrequently Asked Questions
Is air quality bad in Saint-Denis right now?
On 16 July 2026, overall air quality in Saint-Denis is poor. AQI is the main air quality indicator at 63.6/100. Pollution peaks around 4:00 PM (O3: 63.6/100).
Will air quality be worse tomorrow in Saint-Denis?
On 17 July 2026, air quality conditions in Saint-Denis will be better than today, with PM1 forecast at fair at 22.6/100. Pollution peaks around 1:00 PM (O3: 59.7/100).
When is air pollution at its worst in Saint-Denis?
Saint-Denis's toughest days for allergy and air quality sufferers alike are usually calm, dry ones when agricultural traffic and river-valley industry overlap with the oak and plane pollen peak; the wide Loire valley allows steady airflow, offering fairly regular relief. 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-Denis 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: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app