There is some confusion here. Debra is correct in saying that solid prefinished hardwood flooring is safe. If the solid flooring has been finished with UV cured acrylic, which is the current industry standard, they will not contain added formaldehyde and the finish will not emit VOCs because the light cured acrylic finish does not contain solvents like the traditional urethane finish.
However…. engineered hardwood flooring can also be very safe. As an example Eddie Bauer Floors line of engineered flooring and product from some other US manufacturers, does not contain any added formaldehyde glues. Get an engineered hardwood floor rather than laminate. Less glue in the assembly because good quality engineered hardwood uses a plywood backer and laminate uses a pressboard backer. Pick a product that has low or no added formaldehyde. Eddie Bauer Floors and some other good US manufactures offer this kind of product with no added formaldehyde glues and a UV cured acrylic matte finish which does not contain solvents and so does not emit VOCs.
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