This book presents WHO guidelines for the protection of public health from a number of chemicals commonly present in indoor air. The substances considered--benzene, carbon monoxide, formaldehyde, naphthalene, nitrogen dioxide, polycyclic aromatic hydrocarbons (especially benzo a]pyrene), radon, trichloroethylene and tetrachloroethylene--have indoor sources, are known for their hazardousness to health and are often found indoors in concentrations of...