World Health Organization
Indoor Air Quality Standards
Microbial pollution is a key element of indoor air
pollution. It is caused by hundreds of species of bacteria and fungi, in particular filamentous fungi
(mould), growing indoors when sufficient moisture is available. This document providesa 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 guidelines 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.
WHO Indoor Air Quality
Standards
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