The recommended exposure limit for sodium tungstate varies depending on the country and the organization setting the guidelines. In the United States, the Occupational Safety and Health Administration (OSHA) has established a permissible exposure limit (PEL) of 1 mg/m³ for tungsten and its compounds, measured as an 8-hour time-weighted average. The National Institute for Occupational Safety and Health (NIOSH) recommends a recommended exposure limit (REL) of 0.5 mg/m³ for tungsten and its compounds, also measured as an 8-hour TWA. In Europe, the European Union has established a workplace exposure limit of 5 mg/m³ for soluble tungsten compounds, including sodium tungstate.
