Roazhon Park, Rennes Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Roazhon Park is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (PM2.5: 15.5/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Roazhon Park is fair. AQI worsens to fair; PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (PM2.5: 22.0/100).
Explore Forecasts
Pollen & Mold
Air Quality for Neighborhoods
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Good | 15.5/100 |
| PM2.5 (fine particles) | Good | 15.5/100 |
| PM10 (coarse particles) | Good | 12.6/100 |
| NO2 (nitrogen dioxide) | Good | 8.8/100 |
| O3 (ozone) | Good | 14.2/100 |
| SO2 (sulfur dioxide) | Good | 0.5/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 0.9/100 |
| PM1 (ultrafine particles) | Good | 2.1/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 22.0/100 |
| PM2.5 (fine particles) | Fair | 22.0/100 |
| PM10 (coarse particles) | Good | 15.7/100 |
| NO2 (nitrogen dioxide) | Good | 16.3/100 |
| O3 (ozone) | Good | 14.9/100 |
| SO2 (sulfur dioxide) | Good | 0.4/100 |
| CO (carbon monoxide) | Good | 0.7/100 |
| HCHO (formaldehyde) | Good | 1.6/100 |
| PM1 (ultrafine particles) | Good | 7.1/100 |
Local Environmental Conditions
Around this site in Rennes, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Local sources include port and shipping activity. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months. Parks and street trees provide a modest buffer against traffic pollution. Winds here are fairly strong, averaging around 15 km/h, which helps disperse local pollution.
With summer temperatures averaging only about 20°C, ozone rarely becomes a serious problem. In contrast, particle levels tend to be highest from December to February, when home heating and traffic add more emissions and cold, calm spells at around 5°C can leave a light winter haze over the city. December is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Air quality forecast neighborhoods 6 neighborhoods
Sports venues in Rennes 1 sports venue
Frequently Asked Questions About Air Quality in Bretagne
Is air quality bad in Roazhon Park right now?
On 10 October 2026, overall air quality in Roazhon Park is good. AQI is the main air quality indicator at 15.5/100. Pollution peaks around 12:00 PM (PM2.5: 15.5/100).
Will air quality be worse tomorrow in Roazhon Park?
On 11 October 2026, air quality conditions in Roazhon Park will be worse than today, with AQI forecast at fair at 22.0/100. Pollution peaks around 11:00 PM (PM2.5: 22.0/100).
When is air pollution at its worst in Roazhon Park?
With summer temperatures averaging only about 20°C, ozone rarely becomes a serious problem. In contrast, particle levels tend to be highest from December to February, when home heating and traffic add more emissions and cold, calm spells at around 5°C can leave a light winter haze over the city. December is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
Are air quality levels in Roazhon Park 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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |