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In regards to occupational exposures to iron pentacarbonyl, the National Institute for Occupational Safety and Health has set a recommended exposure limit at 0.1 ppm (0.23 mg/m3) over an eight-hour time-weighted average, and a short-term exposure limit at 0.2 ppm (0.45 mg/m3).
The Occupational Safety and Health Administration has set a permissible exposure limit at a ceiling of 5 mg/m3, while the National Institute for Occupational Safety and Health recommends workers not be exposed to more than 0.2 mg/m3, over an eight-hour time-weighted average.
For occupational exposures, the National Institute for Occupational Safety and Health has set a recommended exposure limit at 0.05 ppm (0.3 mg/m3) over an eight hour workday, for dermal exposures.