Ventilation in homes infested by house-dust mites.

An examination was conducted of thirty single family homes with either high or low house-dust mite allergen levels in mattress dust, with regard to ventilation, thermal climate, and air quality. High concentrations were associated with the difference in absolute humidity between indoor and outdoor air, also with low air change rates, especially in the bedroom. The research found no correlation between concentrations of TVOC or formaldehyde in bedroom air and HDM allergen concentration. The air change rate of the house and the infiltration of outdoor air into the bedroom appears to be important in the infestation of house-dust mites in regions with a cold winter.