Formaldehyde concentrations in Wisconsin mobile homes.
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Biomedical subjects
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Sixty-five Wisconsin mobile home households volunteered for an assessment of indoor formaldehyde gas. Sixty-one teenage and adult occupants completed health questionnaires. Formaldehyde concentrations ranged from less than 0.10 to 0.80 ppm, with the risk of ocular discomfort showing a positive dose-response relationship.
Free formaldehyde may be released from wood products and foam insulation where urea-formaldehyde resins have been used. From January, 1978 to November, 1979, 100 structures were investigated by the Wisconsin Division of Health after receiving complaints of health problems from occupants. Air samples were collected in midget impingers and analyzed for formaldehyde content by the chromotropic acid procedure. Health information was obtained from the occupants via questionnaires. Mean formaldehyde concentration observed ranged from below the limit of detection to 3.68 ppm. Eye irritation, burning eyes, runny nose, dry or sore throat, headache, and cough were the primary symptoms which were reported by the occupants. Statistically significant associations were seen between formaldehyde levels and age of home/building materials. Observations presented suggest nonoccupational, indoor environmental exposure to formaldehyde is significant and may reach levels which exceed occupational exposure standards.