SHELLY KUYAT is an industrial hygienist with the National Institute for Occupational Safety and Health (NIOSH) and is a former member of the Eubank, KY, Volunteer Fire Department. LAURA HODSON is a certified industrial hygienist with NIOSH and assistant coordinator of the Nanotechnology Research Center. The findings and conclusions in this report are those of the authors and do not necessarily represent the views of NIOSH.