Worst air pollution La Seyne-sur-Mer, today and tomorrow
Today (20 September): Air quality in La Seyne-sur-Mer is fair. AQI, PM2.5, PM10, O3, and PM1 are fair; NO2, SO2, CO, and HCHO are good. Pollution peaks around 12:00 AM (PM2.5: 39.7/100).
Tomorrow (21 September 2026): Air quality in La Seyne-sur-Mer is fair. O3 decreases to good; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 PM (PM2.5: 37.3/100). Airmine updates local air quality forecasts four times daily.
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La Seyne-sur-Mer's air quality reflects the Toulon metropolitan area's western bay position, with the DCNS naval shipbuilding and the surrounding industrial and port operations generating local industrial emissions alongside vehicle traffic on the A50. The Mediterranean sea breezes and the enclosed Toulon Bay geometry create complex ventilation patterns, while the Mistral wind periodically provides powerful air flushing and the naval shipbuilding operations represent the most distinctive local industrial air quality source.
Today - 20 September | Pollution peaks at 00:00
AQI:
Fair
39.7/100
PM2.5 (fine particles):
Fair
39.7/100
PM10 (coarse particles):
Fair
20.4/100
NO2 (nitrogen dioxide):
Good
18.3/100
O3 (ozone):
Fair
21.4/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
5.7/100
PM1 (ultrafine particles):
Fair
22.7/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 22:00
AQI:
Fair
37.3/100
PM2.5 (fine particles):
Fair
37.3/100
PM10 (coarse particles):
Fair
21.2/100
NO2 (nitrogen dioxide):
Good
17.8/100
O3 (ozone):
Good
18.4/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
7.8/100
PM1 (ultrafine particles):
Good
17.4/100
Pollen forecast in La Seyne-sur-Mer
View pollen forecastFrequently Asked Questions
Is air quality bad in La Seyne-sur-Mer right now?
On 20 September 2026, overall air quality in La Seyne-sur-Mer is fair. AQI is the main air quality indicator at 39.7/100. Pollution peaks around 12:00 AM (PM2.5: 39.7/100).
Will air quality be worse tomorrow in La Seyne-sur-Mer?
On 21 September 2026, air quality conditions in La Seyne-sur-Mer will be similar to today, with AQI forecast at fair at 37.3/100. Pollution peaks around 10:00 PM (PM2.5: 37.3/100).
When is air pollution at its worst in La Seyne-sur-Mer?
In La Seyne-sur-Mer, the combination of tourist traffic and coastal industry and heavy plane and pine pollen in spring is what most affects sensitive groups; the Mistral wind provides powerful periodic ventilation, so poor conditions rarely last more than a couple of days.
Are air quality levels in La Seyne-sur-Mer 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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