Air Quality in Rennes
Bretagne — 35
222,485 inhabitants
8 of 60 cities
Standard deviation: ±7 points
Based on 150 measurements
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Air quality in Rennes: what you need to know
Rennes, capital of Brittany, is a human-scale city recognized for its exceptional quality of life. The oceanic climate with frequent rainfall contributes to atmospheric pollutant "washing." The city early adopted sustainable mobility policies with an efficient automatic metro and extensive cycling network. The compact, largely pedestrianized historic center shows low pollution levels. Residential neighborhoods (Thabor, Sainte-Therese) near urban parks display excellent scores. The average score of 72/100 makes Rennes one of France's major cities with the cleanest air.
Main pollutants in Rennes
Main pollutants: NO2, PM2.5
Pollutant levels in Rennes are among the lowest of comparable French cities. Traffic NO2 is the main pollutant but remains at moderate levels. Frequent rainfall contributes to atmospheric cleansing.
PM2.5 — Fine Particulate Matter
Particles smaller than 2.5 micrometers. From traffic and heating. Penetrate deep into the lungs.
Key pollutantPM10 — Coarse Particulate Matter
Particles smaller than 10 micrometers. From traffic, construction, and erosion. Irritating to airways.
NO2 — Nitrogen Dioxide
Gas mainly from diesel engine combustion. Direct indicator of road traffic. Respiratory irritant.
Key pollutantO3 — Ozone
Secondary pollutant formed by chemical reaction under sunlight. Peaks in summer. Causes respiratory irritation.
SO2 — Sulfur Dioxide
From combustion of sulfur-containing fossil fuels. Found near industrial and port areas.
CO — Carbon Monoxide
Odorless gas from incomplete combustion. Linked to road traffic and faulty heating systems.
Neighborhood comparison in Rennes
Air quality varies significantly between neighborhoods. With a standard deviation of ±7 points, two addresses in Rennes can show very different scores. Only an address-level report reveals the actual air quality.
Impact on real estate in Rennes
Rennes is one of the cities where quality of life weighs most heavily in real estate decisions. The excellent air quality (72/100) is a real asset for sellers. Thabor and Sainte-Therese neighborhoods, near parks, show the best scores and highest prices. An ImmoGrade report for a Rennes property highlights this competitive advantage.
Health tips related to air quality
Check the ImmoGrade for your address before buying or renting a property.
Sensitive individuals (children, elderly, asthma sufferers) should be particularly cautious in areas scoring below 50/100.
Choose homes away from major roads and near green spaces for better indoor air quality.
Ventilate your home early in the morning or late in the evening, when pollution levels are lowest.
National Ranking — Top 5
| # | City | Score |
|---|---|---|
| 1 | Brest | 82/100 |
| 2 | Lorient | 78/100 |
| 3 | La Rochelle | 77/100 |
| 4 | Bayonne | 76/100 |
| 5 | Ajaccio | 75/100 |
Air Quality in Bretagne
Frequently asked questions about air quality in Rennes
Does Rennes have good air quality?
Yes, with a score of 72/100, Rennes ranks among France's best major cities. The Breton climate and soft mobility policies contribute to these excellent results.
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