In an August 7, 2009, letter to the White House Office of Science Technology and Policy (OSTP), the Environmental Council of the States (ECOS) expressed its interest in working with OSTP and other federal agencies regarding the “human health and ecological impacts and lifecycle consequences of intentional and unintentional releases of engineered nanoparticles into the environment.” According to ECOS, state environmental agencies want to participate in national efforts to develop best assessment and management practices. ECOS suggests that one option is for ECOS to join one or more of the Nanoscale Science, Engineering, and Technology (NSET) Subcommittee Working Groups within the National Nanotechnology Initiative (NNI) framework. ECOS asked OSTP for a meeting, “preferably this summer,” to obtain feedback on its key areas of interest and to discuss the best opportunities for its involvement in national efforts.