New Current Intelligence Bulletin issued by CDC’s National Institute for Occupational Safety and Health (NIOSH) reports the results of research in which various types of carbon nanotubes/carbon nanofibers can cause pulmonary fibrosis, inflammatory effects, and granulomas in laboratory animals exposed to them by inhalation. NIOSH considers these animal study findings to be relevant to human health risk because similar lung effects have been observed in workers exposed to respirable particulates of other materials in dusty jobs.

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