FIGURE 1.

Overview of physical and environmental characteristics of the alpine altitude climate compared to sea level. Several physical characteristics change with increasing altitude, such as barometric pressure and inspiratory oxygen pressure, air density, relative temperature, and humidity. Environmental characteristics vary in different climate zones, because of factors like air pollution and climate change. The environmental characteristics of the alpine climate include reduced aeroallergen burden regarding HDM, pollen, fungi, air pollution, and different microbial exposure. HDM, house dust mite