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natural sources
The formation of formaldehyde results mainly from the photochemical oxidation of methane that is naturally present in the atmosphere, as well as the natural decomposition of Volatile Organic Compounds (VOC). Formaldehyde is also present in many foodstuffs such as fruit, meat and vegetables, sometimes in significant doses. The natural decomposition of methane (for instance, from livestock production and agriculture) and Volatile Organic Compounds (VOC) produced by human activity is a source of formaldehyde (including motors, heating appliances, cooking, etc.).It is produced on an industrial scale in the form of a gas. In a water solution, form formaldehyde gives formalin/ formol.