There are several environmental concerns associated with incinerators, including the use of a homemade waste incinerator. Carbon dioxide is emitted from any fire and is potentially deadly, and sulfur dioxide and hydrochloric acid may be present in incinerators as well. There is also a risk of fire and explosion when using a homemade incinerator, posing both a danger and an environmental concern. Avoid placing highly combustible or explosive materials in the incinerator to minimize these risks. Plastics and certain other materials can produce toxic fumes and should not be incinerated. This includes roof shingles and vinyl siding. These items should be disposed of at a landfill instead.