WHO guidelines for indoor air quality: dampness and mould

Abstract

Microbial pollution is a key element of indoor air pollution. It is caused by hundredsof 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 associatedwith building moisture and biological agents. The review concludes that the mostimportant effects are increased prevalences of respiratory symptoms, allergiesand asthma as well as perturbation of the immunological system. The documentalso summarizes the available information on the conditions that determine thepresence of mould and measures to control their growth indoors. WHO guidelinesfor protecting public health are formulated on the basis of the review. Themost important means for avoiding adverse health effects is the prevention (‎orminimization)‎ of persistent dampness and microbial growth on interior surfacesand in building structures.