House-dust mites and associated environmental conditions in Danish homes.

Describes and investigation of house-dust mites in 96 Danish homes with one or more members with asthma. All the homes were measured for air exchange rates, humidity and temperature. The study found a positive correlation between indoor air humidity and mite concentration and an inverse correlation between house-dust mite concentration and indoor air exchange. House-dust mite concentration was higher in the houses with mite-allergic persons. In 76% of the homes the concentration was above the proposed limit of 10 mites/0.1 g dust. This was so in 48% of the non-allergic homes. The results suggested that mites infestation has increased in homes in Denmark, and the results indicate that reduced ventilation in homes involves a risk of increased house-dust mite exposure.