In view of animal studies indicating that formaldehyde (50000) was a carcinogen, this testimony provided evidence to support the position that exposure to formaldehyde be kept to the lowest feasible concentration possible; 0.1 part per million (ppm) in air by collection of an air sample for any 15 minute period, the lowest quantifiable detected concentration at the present time. Significant excesses of squamous cell carcinomas of the nasal cavity were found in both male and female Fischer-344-rats, in male hybrid- mice, and in male Sprague-Dawley-rats. Results of individual studies suggested a connection between formaldehyde exposure and the incidence of lung cancer, brain cancer, leukemia, and nasopharyngeal cancer. The mutagenicity of formaldehyde was demonstrated in studies on fruit-flies, grasshoppers, flowering plants, fungi, and bacteria. Evidence suggested that formaldehyde forms cross linking bonds between DNA and protein at concentrations of 6ppm and greater. Examination of workplace exposure data suggested that in most occupations formaldehyde exposures were below 0.5ppm concentration levels with only 10 percent being above 1ppm. Problems encountered using particular monitoring and respiratory protective equipment were briefly considered.