The Environmental Protection Agency is considering dropping its plan to consider arsenic's inhalation risks as part of its pending assessment of the metalloid's ingestion risks because the congressionally mandated National Research Council (NRC) panel peer-reviewing the analysis is tasked only with reviewing EPA's ingestion analysis and lacks expertise to review the inhalation data. Arsenic has come up as a key chemical of concern as OSHA explores updating workplace permissible exposure limits.
December 29, 2025