Because of its location at the bottom of a wide valley, Arosa is very sunny and to a great extent sheltered from strong winds. As there is no transit traffic, the air is particularly pure which is why Arosa has been a famous Alpine health resort since 1877. Arosa is accessible by Rhaetian Railways from Chur or by car across over 365 serpentines and through several tunnels, past the smaller holiday resort of Langwies.