The Air differs as you progress increased and higher to the environment. The air gets "thinner" as elevation climbs due to the fact there are actually less air molecules up there. Mountain climbers usually need to use canisters of oxygen since they climb higher than 3,800 meters (12,five hundred ft) https://www.dailypioneer.com/2025/page1/smoke-smell--unruly-passenger-affects-ai-flight-service.html