5. Formaldehyde
Formaldehyde is a colorless, strong-smelling gas often used in building materials and household products like furniture, flooring, and insulation. It’s also used in some cosmetic products and disinfectants. Prolonged exposure to formaldehyde can irritate the eyes, nose, and throat, as well as increase the risk of certain cancers.
Avoidance of direct contact and adequate ventilation are key to reducing exposure.