Vapor phase formaldehyde breaks down in the air within hours.[1] It will also be destroyed in the soil by any number of mechanisms, with a half-life of about 1

Vapor phase formaldehyde breaks down in the air within hours.[1] It will also be destroyed in the soil by any number of mechanisms, with a half-life of about 14 days. [2] [1] https://www.atsdr.cdc.gov/toxfaqs/tfacts111.pdf https://www.atsdr.cdc.gov/toxfaqs/tfacts111.pdf [2] https://webwiser.nlm.nih.gov/substance?substanceId=1&identifier=Formaldehyde&identifierType=name&menuItemId=76&catId=115 https://webwiser.nlm.nih.gov/substance?substanceId=1&identif...