The Toxics Management Division (TMD) in the City of Berkeley’s Planning and Development Department has issued guidance on the nanoparticle municipal ordinance that the Berkeley City Council adopted on December 12, 2006. Under the ordinance, facilities that manufacture or use “manufactured nanoparticles” must submit to the TMD “a separate written disclosure of the current toxicology of the materials reported, to the extent known, and how the facility will safely handle, monitor, contain, dispose, track inventory, prevent releases and mitigate such materials.” The term “manufactured nanoparticles” is defined to mean particles “with one axis less than 100 nanometers in length.” The TMD guidance makes clear that facility reports covering the period June 1, 2007June 2, 2008, are due by June 1, 2007, and must include, among other things, toxicological and ecological information about the nanoscale material and information about the potential exposure pathways and likelihood of exposure via those pathways.