Formaldehyde Formaldehyde is a smelly, colourless, flammable gas classified as a Group 1 carcinogen by the IARC. It is known to cause cancer in humans and animals. It can irritate the eyes, nose, and throat, and trigger asthma. Formaldehyde emissions generally decrease over time (i.e. off-gas), but it can take seven years just to reach…
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