Symptoms of upper airway irritation include dry or sore throat, itching and burning sensations of the nose and nasal congestion. Tolerance to this level of exposure may develop within 1-2 h. This tolerance can permit workers remaining in an environment of gradually increasing formaldehyde concentrations to be unaware of their increasingly hazardous exposure. [9],[10],[11],[12],[13] Formaldehyde has also been reported to produce allergic contact dermatitis, [14] neurobehavioral changes [15] and carcinogenesis. [16] Formaldehyde may on rare occasions induce bronchial asthma at relatively high exposure doses. The approach to formaldehyde-induced symptoms should be one of the careful documentation of objective physiologic changes. [17] The annual production of formaldehyde (around 2005) was 21 million tons (46 billion pounds). In view of its widespread use, toxicity and volatility, exposure to formaldehyde is a significant