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A text designation established by an organization (e.g., EPA, OSHA, scientific body, state agency) or a regulation for a grouping of chemicals that have a combined limit (e.g., regulatory, exposure) that applies to the total amount of all category members. Example: "Arsenic and compounds" has a 0.1 mg/m3 Occupational Exposure Limit (OEL) (set under the OSHA Hazardous Chemical Substances Regulations of 1995). This OEL would apply to the combined total weights of arsenic oxide, arsenic hydride, and arsenic sulphide. |