The Office of Environmental Health Hazard Assessment (OEHHA) adopts new cancer inhalation unit risk (IUR) and slope factors for Cobalt and Cobalt Compounds for use in the Air Toxics Hot Spots Program.
The values for Cobalt and Cobalt Compounds are as follows:
1.Cobalt metal and water-insoluble cobalt compounds (normalized to cobalt content)
● Unit Risk Factor – 7.7 × 10-3 (µg/m3)-1
Inhalation Slope Factor – 27 (mg/kg-day)-1
2.Water-soluble cobalt compounds (normalized to cobalt content)
● Unit Risk Factor – 8.6 × 10-4 (µg/m3)-1
Inhalation Slope Factor – 3.0 (mg/kg-day)-1
OEHHA said this was developed by new Inhalation Unit Risk Factors (IURs) and was done by revising existing IURs for many air pollutants.
Reference: https://oehha.ca.gov/
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