What is the dangers of a five-year-old inhaling polyurethane fumes?

FOR AN ExcelLENT ARTICLE ON THE DANGERS OF POLYURETHANE, PLEASE GO TO AN ARTICLE IN NATIONAL GEOGRAPHIC'S, "THE GREEN GUIDE."

http://www.thegreenguide.com/doc/ask/poly

That article appears to have gone from The Green Guide. In any event, the URL no longer works. Any other suggestions on reading matter?