Conclusions
dyspnoea
Despite surgical masks and FFP2 were associated with higher rates of dyspnoea, their use had no clinically relevant impact on gas exchange at 3000-m altitude both at rest and during moderate exercise, and no detectable effect on cognitive performance at rest. Wearing a surgical mask or an FFP2 can be considered safe for healthy people living, working or spending their leisure time in mountains, high-altitude cities or other hypobaric environments (e.g. aircrafts) up to an altitude of 3000 m.