Formaldehyde is highly reactive, causing irritation and acute and chronic toxicity in target tissues (the eyes, respiratory tract, and skin) following inhalation and/or skin contact. Moreover, formaldehyde is a local carcinogen after inhalation exposure. It induces nasal squamous cell carcinoma in laboratory animals and nasopharyngeal carcinoma in humans, albeit less convincingly. While formaldehyde has been evaluated and clas...