Mites represent the main source of allergens in humid
areas and sensitization to their allergens is a major risk
factor for asthma in exposed individuals [1-3]. Galicia is
situated on the northwest corner of Spain. Its situation
and geographic extension—from the sea to the central
plateau of Spain—mean that it has both a maritime and
an Atlantic climate. However, Galicia has some degree
of climatic diversity. In the coastal strip, temperatures
range from 8C to10C in the winter and 20C to 25C in
the summer. The inner provinces of Lugo and Ourense
have a drier climate, with greater differences between
extreme temperatures in the summer and winter.