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Canada · British Columbia: WorkSafeBC jurisdictionIn force

British Columbia styrene limits take effect

British Columbia removed styrene from WorkSafeBC's excluded-substances table on January 8, 2025. The resulting limits are a 10 ppm eight-hour time-weighted average and a 20 ppm short-term exposure limit within the applicable WorkSafeBC regime.

Scope to keep in mind

The previous numerical limits were not independently established in this review, so no numerical reduction is asserted.

Legal status
in force
Source check
Sep 17, 2026
Topic
Styrene
Technical review
Jiaxi · 2026-09-23

What changed

Previous requirement

No earlier requirement established for this event.

New requirement or current position

10 ppm 8-hour TWA and 20 ppm short-term exposure limit.

Who it affects

  • Resins
  • Composites
  • Plastics

Dates and milestones

Commencement and compliance dates can differ. Read the conditions beside each date, including any stay or local adoption requirement.

Announcement or publication
Not established or not applicable
Recorded effective date
Jan 8, 2025

Selected exposure values

These values need the scope, limit type and averaging period shown below. A proposed or advisory value is not a binding limit.

Styrene

10 ppm
Averaging period8 hours
Limit typeTWA
ScopeWorkSafeBC workplaces

Styrene

20 ppm
Averaging period15 minutes
Limit typeSTEL
ScopeWorkSafeBC workplaces

What this could mean for your IH program

Review styrene sampling and controls using both averaging periods.

Confirm applicability with a qualified practitioner before changing your program.

Questions and qualifications

  • Previous numerical limits were not independently verified.

Source evidence

  1. Decision on the 2020 ACGIH TLVs for Styrene

    WorkSafeBC · Effective-date paragraph and table

    Styrene assigned 10 ppm 8-hour TWA and 20 ppm STEL from January 8, 2025.

  2. BOD Decision 2024/11/20-04: Styrene

    WorkSafeBC · Decision summary and meeting date

    Confirms approval and January 8, 2025 removal from excluded substances.

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