Lead is a naturally occurring element in soil and is also collected from the air and other sources.
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Carbon monoxide is a colourless, odorless gas. It is a by-product of incomplete combustion, such as natural gas, liquid fuels, and anything that burns.
Asbestos is a fibrous material that was used in many building materials as acoustic insulation, a fire-resistant material, a binder in other products such as roofing material, and was also used as thermal insulation.