Backyard bonfires are awesome! However, there are definitely some things that should not be burned.
One example is plastic – never put anything plastic in the fire. It’s toxic for you and it’s bad for the environment. Magazines are another example of this – recycling is a much better option than burning in this case.
Family Handyman said, “It may come as a surprise, but wooden pallets are NOT a good option to fuel a fire pit. Some wood pallets are treated with a chemical called methyl bromide (labeled with the initials MB), which can be released into the air when the wood burns.”
Finally, stay away from burning trash, painted wood, and particleboard as well.