People with asthma often migrate to “dry ecodomains” to manage their condition. In British Columbia, Canada, there is one of these areas, which covers the southern interior plateau and is an extension of the dry climate regime that occupies the interior of northern Mexico and the northwestern United States.
Its two most commonly recognized climates are arid desert and semiarid steppe. The dry ecodomain in southern British Columbia includes the leeward ranges of the Coast Mountains, the Thompson Plateau, the Clear Range, the Okanagan Range, and the western side of the Okanagan and Shuswap highlands.
Winters are cold and the summers are warm to hot. Vegetation in the valleys and basins is typically steppe or bunchgrass prairie that may contain sagebrush or occasional ponderosa pine or Douglas-fir. At higher altitudes, subalpine coniferous forests can become established.
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Sources: http://www.env.gov.bc.ca/ecology/ecoregions/dryeco.html Accessed 17 December 2010