Formaldehyde is a volatile organic compound that is involved in the formation of photochemical smog in heavy metropolitan areas. What is most likely a direct source of formaldehyde in the atmosphere?

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common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.