On July 28, 2010, the U.S. Environmental Protection Agency (EPA) published a Federal Register notice announcing that it is reopening the comment period for its February 3, 2010, proposed significant new use rule (SNUR) for the chemical substance identified generically as multi-walled carbon nanotubes (P-08-199). According to the July 28, 2010, notice, a commenter noted that neither the proposed rule nor the docket contained specific carbon nanotube data or data supporting the nature of the dermal concern for carbon nanotubes. The commenter stated it was not possible to assess EPA’s evaluation and determination based on the current record. Another commenter noted that EPA’s subsequent reviews and concerns for carbon nanotubes have expanded, and that the proposed SNUR should reflect those updated data. EPA states that it has added additional explanation and references of its health and environmental concerns for carbon nanotubes to the public docket for consideration, and is reopening the comment period for 30 days. Comments are due August 27, 2010.