On March 1, 2010, Health Canada began a public consultation on its adoption of the Interim Policy Statement on Health Canada’s Working Definition for Nanomaterials (Interim Policy). Although Health Canada is accepting comments, it states that the Interim Policy “is effective immediately.” In preparing the Interim Policy, Health Canada states that it sought the informal feedback of some international stakeholders, industry trade groups, standards associations, and other Canadian federal departments. Comments are due August 31, 2010, and Health Canada intends to use the comments to update the Interim Policy as necessary.