Not all pallets should be burned, you may check the pallet stamp before to be sure that the pallet is safe and was not chemically treated with the fumigant methyl bromide (labeled with the initials MB). If so, they are unsafe to burn.. You can find more information on how to know if the pallet is safe in our in-depth article on pallet safety. Also, pallets may have been exposed to a variety of chemicals while they were in use, check visually is the wood is clean and if you are unsure, do not burn them.