October 7, 2026
British Columbia’s July 10, 2024 exposure-limit decision changed selected substance values and definitions within WorkSafeBC jurisdiction. Its adoption table distinguishes inhalable and respirable particle fractions, which matters when matching an assessment to the applicable value.
Selected eight-hour time-weighted averages are 0.5 mg/m³ for inhalable metallic chromium, 0.02 mg/m³ for inhalable cobalt and inorganic compounds, and 0.1 mg/m³ for inhalable manganese and inorganic compounds. The table expressly leaves the respirable manganese value of 0.02 mg/m³ unchanged. These examples cover only part of the decision.
The British Columbia chemical-limit record retains the original adoption date and supporting decision. The Board’s resolution records the May 2024 decision preceding the July commencement.
Keep the sampling fraction beside the result
APT’s practical interpretation is to check the particle fraction recorded in each sampling plan and laboratory result before selecting a comparison value. Inhalable and respirable measurements need to remain separately identified, even when both relate to the same metal.
The decision is a historical adoption event. A current assessment also needs the latest applicable WorkSafeBC table and any later substance-specific decisions. Mines Act workplaces require a separate jurisdiction check; WorkSafeBC’s values should not automatically be assigned to every British Columbia mine.
For related developments, consult the industrial hygiene regulatory tracker.
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