Odour neutralization inside railway trains is ensured by Biothys through the Gel-O-Dor technology, which is directly integrated into the ventilation system. This solution relies on neutralizing gel plates that provide a gradual and continuous release of active agents at the source of odour emissions. Easy to implement without any modification to the existing system, this solution ensures long-lasting improvement of onboard air quality while complying with the technical constraints of the railway sector.