After evaluating the available scientific evidence, NIOSH has determined that it is insufficient to support developing a size-specific recommended exposure limit (REL) for silver nanomaterials. In the absence of information to support a size-specific REL, worker exposures to silver dust, fume, and soluble compounds should be maintained below the NIOSH REL of 10 µg/m3 as an 8-hour time-weighted average.

The American Industrial Hygiene Association (AIHA) expresses its appreciation to the National Institute for Occupational Safety and Health (NIOSH) for the opportunity to comment on the NIOSH Draft Current Intelligence Bulletin “Update of NIOSH Carcinogen Classification and Target Risk Level Policy for Chemical Hazards in the Workplace.”