Worst air pollution Cergy, today and tomorrow
Today (16 July): Air quality in Cergy is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 57.7/100).
Tomorrow (17 July 2026): Air quality in Cergy is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 PM (O3: 39.0/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Cergy's air quality reflects the Oise-Seine river confluence in the greater Paris metropolitan area, with vehicle traffic on the A15 motorway and the surrounding new town residential and commercial character generating elevated NOₓ. The Seine and Oise river corridors provide limited ventilation, while prevailing westerlies carry Atlantic air through the Paris basin and Cergy's northwestern Paris position means it receives Atlantic air before the densest Paris urban pollution corridor.
Today - 16 July | Pollution peaks at 16:00
AQI:
Medium
57.7/100
PM2.5 (fine particles):
Good
11.2/100
PM10 (coarse particles):
Good
3.4/100
NO2 (nitrogen dioxide):
Good
16.1/100
O3 (ozone):
Medium
57.7/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Good
13.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 14:00
AQI:
Fair
39.0/100
PM2.5 (fine particles):
Good
12.0/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
18.5/100
O3 (ozone):
Fair
39.0/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.9/100
PM1 (ultrafine particles):
Good
15.2/100
Pollen forecast in Cergy
View pollen forecastFrequently Asked Questions
Is air quality bad in Cergy right now?
On 16 July 2026, overall air quality in Cergy is medium. AQI is the main air quality indicator at 57.7/100. Pollution peaks around 4:00 PM (O3: 57.7/100).
Will air quality be worse tomorrow in Cergy?
On 17 July 2026, air quality conditions in Cergy will be worse than today, with AQI forecast at fair at 39.0/100. Pollution peaks around 2:00 PM (O3: 39.0/100).
When is air pollution at its worst in Cergy?
The days that hit sensitive groups hardest in Cergy 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. Nearby Loire valley cereal farmland and vineyards add a further seasonal factor.
Are air quality levels in Cergy 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.
Want to see air quality forecasts for other cities in France?
Check air quality in other popular cities:
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