This is wood that is used mostly for outdoor construction-in decks, for example. Pressure-treated wood has been chemically impregnated with preservatives that resist rot and insects. While this treatment can make wood durable and long-lasting (definitely a plus for the environment), the wood must be handled with care. Working with it (cutting it and producing sawdust, for example) can lead to dangerous exposure to the toxic chemicals that permeate the wood; disposing of it is also a problem, as it must be treated as hazardous waste. Pressure-treated wood should never be burned, as it can create toxic fumes and ash.

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