"One birch plank from China, bought at a Home Depot store in Portland, gave off 100 times more formaldehyde than legal in Japan and 30 times more than allowed in Europe and China, according to July tests conducted by a lab hired by an Oregon-based wood products manufacturer. Formaldehyde exposure has been shown in human studies to cause nose and throat cancer and possibly leukemia, as well as allergic reactions, asthma attacks, headaches and sore throats
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