Who Guidelines for Indoor Air Quality: Dampness and Mould

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  • 2 February 2015 Create Date
  • 25 September 2019 Last Updated

Microbial pollution is a key element of indoor air pollution. It is caused by hun- dreds of species of bacteria and fungi, in particular filamentous fungi (mould), growing indoors when sufficient moisture is available. This document provides a comprehensive review of the scientific evidence on health problems associated with building moisture and biological agents. The review concludes that the most important effects are increased prevalences of respiratory symptoms, allergies and asthma as well as perturbation of the immunological system. The document also summarizes the available information on the conditions that determine the presence of mould and measures to control their growth indoors. WHO guide- lines for protecting public health are formulated on the basis of the review. The most important means for avoiding adverse health effects is the prevention (or minimization) of persistent dampness and microbial growth on interior surfaces and in building structures.


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Who Guidelines for Indoor Air Quality: Dampness and Mould