Rennes Métropole launches air quality monitoring program

Rennes Métropole is offering residents who use wood heating the chance to borrow air quality measurement devices for three weeks. The initiative involves local authorities and environmental organizations, aiming to help users understand the impact of their heating practices on air quality.

Participants receive monitoring equipment

Those who join the program receive a bag containing a sensor to measure carbon dioxide (CO2) and fine particles PM2.5, as well as a thermometer to monitor chimney or stove flue temperature. Experimentation sheets are included to help users record and compare their measurements over time.

Eligibility and registration process

The program is open to residents of Rennes Métropole communes who have a chimney or wood stove. Participants must sign a contract and present an identity document when collecting the equipment. Registration is done online, but selection is not automatic—participants are contacted individually to confirm their involvement.

Wood heating contributes significantly to pollution

According to Rennes Métropole, individual wood heating devices account for 43.3% of PM2.5 emissions in the area. A 2025 study by Air Breizh found that biomass combustion had a noticeable impact on air quality, particularly in the evenings during the winter of 2024.

Best practices for reducing emissions

The local authority recommends using dry wood with a moisture content below 23%, stored in a well-ventilated area. It also advises against burning painted or treated wood and waste. Proper air intake adjustment, regular maintenance, and flue cleaning are emphasized to ensure more efficient combustion.

Program timeline and locations

The first session for equipment pickup is scheduled for November 9, 2026, at the Maison de la consommation et de l'environnement (MCE) in Rennes. Equipment must be returned by December 1. Additional sessions are planned in December and January, with a third session in Chevaigné. For those seeking advice, "Bûche Tour" stops will be held in several communes in late November.