According to cleanrooms online:
“The U.S. House of Representatives has passed H.R. 554, the National Nanotechnology Initiative Amendments Act of 2009, by voice vote. The bill is intended to strengthen and provide transparency in federal research efforts to understand the potential environmental, health, and safety risks of nanotechnology. It is identical to H.R. 5940, which passed the House in the 110th Congress.”
Here is an op-ed that Mike Honda wrote on the issue earlier this month.
House passes nanotech safety bill