Concern about whether formaldehyde might cause cancer in humans arose in the late 1970s and early 1980s, when it was discovered that high levels of formaldehyde (6-15 parts per million) caused nasal cancer in laboratory rats...
Formaldehyde exposure has not been demonstrated to cause bronchial asthma. The Agency for Toxic Substances and Disease Registry states that investigations into this possibility have provided very limited evidence of an association.
Formaldehyde is not considered to have reproductive or developmental effects on humans. A comprehensive review of the scientific literature concluded...