This report deals with the effects of formaldehyde on animals, humans, and in in vitro tests. The Committee conducted an extensive search of the literature on formaldehyde. From a review of several hundred references, it selected material pertinent to an assessment of the health risks associated with exposure to airborne formaldehyde. For more details and inclusive surveys of potential health effects, the reader is referred to several reviews on this subject (Battelle Columbus Laboratories, 1977b; CIIT, 1979a; Loomis, 1979; NRC, [1980]; USDHEW, 1976a).