The use of carbon monoxide was put under the spotlight during the Tour de France last year when the cycling website Escape Collective reported that riders from multiple teams inhaled the toxic gas to optimize altitude training.

Two-time Tour de France champion Jonas Vingegaard is calling for a ban of the controversial carbon monoxide rebreathing method used by athletes to measure their performances.

Jonas Vingegaard has a distinct opinion on the discussion of carbon monoxide doping. In an interview with Le Monde, the Danish star of Visma | Lease a Bike calls for its immediate prohibition. Who says Tadej Pogacar and Jonas Vingegaard says doping questions.