查了一些资料,貌似甲醛含量已经立法了。
On July 7, 2010, President Obama signed the Formaldehyde Standards for
Composite Wood Products Act (PDF, 9 pp., 135 K, about PDF) into law. This
legislation, which adds a Title VI to TSCA, establishes limits for
formaldehyde emissions from composite wood products: hardwood plywood,
medium-density fiberboard, and particleboard. The national emission
standards in the Act mirror standards previously established by the
California Air Resources Board for products sold, offered for sale, supplied
, used or manufactured for sale in California. Congress directs EPA to
promulgate final regulations implementing the Act by January 1, 2013. Learn
more at www.epa.gov/opptintr/chemtest/formaldehyde/ .