WorkSafeBC has updated its workplace exposure limits for styrene, a chemical commonly used in manufacturing, effective Jan. 8, 2025. The move aligns British Columbia with the 2020 Threshold Limit Values (TLVs) set by the American Conference of Governmental Industrial Hygienists (ACGIH).
The agency’s Board of Directors approved the change during its November 2024 meeting. As a result, styrene will be removed from the Table of Exposure Limits for Excluded Substances in Policy R5.48-1 of the Prevention Manual. The new limits establish a maximum 8-hour time-weighted average exposure of 10 parts per million (ppm) and a short-term exposure limit of 20 ppm.
These revised thresholds are designed to better protect workers who may be exposed to styrene, which is commonly used in the production of plastics, rubber, and resins. Employers in industries where styrene is handled will need to adjust workplace practices to ensure compliance with the updated limits.
Styrene exposure can pose health risks, including irritation of the skin, eyes, and respiratory system, according to previous guidance from the ACGIH. Employers are expected to review their hazard assessments and implement controls to limit exposure where necessary.
The new limits reflect WorkSafeBC’s ongoing effort to align its regulations with international standards.
