Worst air pollution Saint-Étienne, today and tomorrow
Today (16 July): Air quality in Saint-Étienne is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 49.2/100).
Tomorrow (17 July 2026): Air quality in Saint-Étienne is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 36.4/100). 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-Étienne's air quality reflects its position in the enclosed Loire plain basin surrounded by the Massif Central mountains, with vehicle traffic on the A47 and the legacy of coal mining and arms manufacturing generating background industrial PM2.5 alongside winter residential wood burning. The Loire valley's topographic enclosure can concentrate emissions under calm anticyclonic conditions, while the Massif Central plateau provides clean air on most westerly and northwesterly wind days above the enclosed basin floor.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
49.2/100
PM2.5 (fine particles):
Good
9.9/100
PM10 (coarse particles):
Good
4.3/100
NO2 (nitrogen dioxide):
Fair
22.0/100
O3 (ozone):
Medium
49.2/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.6/100
PM1 (ultrafine particles):
Good
10.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Fair
36.4/100
PM2.5 (fine particles):
Good
8.7/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Fair
21.4/100
O3 (ozone):
Fair
36.4/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.5/100
PM1 (ultrafine particles):
Good
8.9/100
Pollen forecast in Saint-Étienne
View pollen forecastSports venues in Saint-Étienne
Frequently Asked Questions
Is air quality bad in Saint-Étienne right now?
On 16 July 2026, overall air quality in Saint-Étienne is fair. NO2 is the main pollutant at 22.0/100. Pollution peaks around 1:00 PM (O3: 49.2/100).
Will air quality be worse tomorrow in Saint-Étienne?
On 17 July 2026, air quality conditions in Saint-Étienne will be similar to today, with AQI forecast at fair at 36.4/100. Pollution peaks around 1:00 PM (O3: 36.4/100).
When is air pollution at its worst in Saint-Étienne?
Residents in Saint-Étienne tend to notice the most discomfort when valley motorway traffic and light industry build up alongside the spring peak in birch and oak pollen; mountain valley winds alternate with calm temperature inversions, which typically keeps things from getting worse for long.
Are air quality levels in Saint-Étienne 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