Domestic ventilation rates, indoor humidity and dust mite allergens : are our homes causing the asthma pandemic?

This paper is concerned with historical changes in domestic ventilation rates, relative humidity and the associated risk of house dust mite colonization. A controlled trial evaluated allergen and water vapour control measures on the level of house dust mite (HDM) Der p1 allergen and indoor humidity, concurrently with changes in lung function in 54 subjects who completed the protocol. Mechanical heat recovery ventilation units significantly reduced moisture content in the active group, while HDM allergen reservoirs in carpets and beds were reduced by circa 96%. Self reported health status confirmed a significant clinical improvement in the active group. The study can form the basis for assessing minimum winter ventilation rates that can suppress RH below the critical ambient equilibrium humidity of 60% and thus inhibit dust mite colonization and activity in temperate and maritime in' uenced climatic regions

Are our homes making us ill? The impact of energy efficiency on indoor air quality

The World Health Organization estimates that over 100,000 people die every year from conditions resulting from occupational exposure to asbestos. Similar to this, a significant proportion of asthma and related ill health is driven by poor indoor air quality. Stirling Howieson, Senior Lecturer in Architecture at the University of Strathclyde, takes a look at the increasing prevalence of asthma and asks the question, are our homes making us ill