​BTEX and benzene exposure testing in Calgary is critical following the 2024 ACGIH limit reduction to 0.02 ppm. Western Health & Safety is a CIH-led industrial hygiene consultant serving Alberta and British Columbia, providing air sampling and exposure assessment for oil and gas and industrial worksites.
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BTEX and benzene exposure testing in Calgary is used to assess worker exposure in oil and gas and industrial environments. 
Western Health & Safety is a CIH-led industrial hygiene consultant serving Alberta and British Columbia, providing air sampling, exposure assessment, and interpretation to support compliance and worker safety.
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What is BTEX and Where is it Found?

​BTEX refers to a group of volatile organic compounds:
  • Benzene
  • Toluene
  • Ethylbenzene
  • Xylene
These compounds are commonly found in:
  • Oil and gas operations
  • Fuel storage and transfer systems
  • Solvents and industrial processes
  • Confined or poorly ventilated environments
Exposure can occur through inhalation and, in some cases, skin contact.
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When is BTEX or VOC Air Testing Required?

BTEX and VOC testing is typically required when there is potential for worker exposure or air quality concerns. Common scenarios include:
  • Oil and gas production sites
  • Fuel handling and storage facilities
  • Confined space entry
  • Odour complaints or air quality concerns
  • Suspected benzene exposure
  • Regulatory or compliance-driven monitoring
Testing is especially important when exposure conditions vary by task, location, or environmental factors.
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2024 Benzene Exposure Limits – What Changed?

As of 2024, the American Conference of Governmental Industrial Hygienists (ACGIH) significantly reduced the Threshold Limit Value (TLV) for benzene:
  • TLV-TWA (8-hour): 0.02 ppm
  • Short-Term Exposure Limit (STEL): Eliminated
  • Skin Notation: Added (dermal absorption risk)
  • Carcinogen Classification: A1 – Confirmed human carcinogen
This represents a 25-fold reduction from the previous 0.5 ppm current Alberta Occupational Exposure Limit and the WorkSafeBC exposure Limit.
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Why This Matters for Alberta & BC Worksites

This change has significant implications for:
  • Oil and gas operations
  • Industrial facilities
  • Fuel-related environments
At these lower thresholds:
  • Previously acceptable exposure levels may now exceed guidance.  Check out more information regarding the ACGIH revised exposure limit for benzene on our blog site.
  • More sensitive sampling methods are required
  • Exposure variability becomes a critical factor in decision-making
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The Real Challenge: Measuring vs Understanding Exposure

At 0.02 ppm, detecting benzene is no longer the only challenge. The real issue is confidence in your exposure data. Limited sampling can:
  • Miss peak exposures
  • Underestimate worker risk
  • Create false confidence in compliance
This is why interpreting exposure results is just as important as collecting them.

Why BTEX Results Are Often Misinterpreted

BTEX exposure is highly variable.
It can change based on:
  • Task being performed
  • Proximity to source
  • Weather and ventilation conditions
  • Duration of exposure
Relying on a small number of samples can lead to inaccurate conclusions about worker risk. Review our blog on -- why below-exposure-limits-doesnt-always-mean-safe-a-practical-guide-for-alberta-worksites

Our CIH-Led Approach to BTEX and Benzene Exposure Assessment

Western Health & Safety provides CIH-led industrial hygiene assessments across Calgary, Alberta, and British Columbia. Our approach includes:
  • Task-based and worker-specific sampling strategies
  • Evaluation of exposure variability
  • Interpretation of results in real-world conditions
  • Practical recommendations for exposure control
At lower benzene limits, data interpretation—not just sampling—drives better decisions.

Request BTEX / VOC Air Testing

If you are concerned about benzene exposure or require compliance monitoring, a proper assessment is critical.

CIH-led industrial hygiene assessments across Calgary, Alberta, and British Columbia.
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Frequently Asked Questions – BTEX & Benzene Testing Calgary

❓What is BTEX testing used for?

BTEX testing is used to measure exposure to benzene and related compounds in workplaces such as oil and gas operations, industrial facilities, and fuel handling environments.
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❓When Do You Need BTEX Testing?

You may need BTEX or benzene exposure testing in Alberta or BC if:
  • Workers are exposed to fuel or hydrocarbons
  • You operate in oil and gas environments
  • Odours or air quality concerns are present
  • Regulatory or compliance requirements apply
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❓Why is benzene exposure a concern?

Benzene is a confirmed human carcinogen associated with blood disorders and leukemia. Even low-level, long-term exposure can pose health risks.
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❓What is the current benzene exposure limit?

In Alberta and BC the current exposure limit is 0.5 ppm, however both jurisdictions are reviewing the the ACGIH TLV for benzene of 0.02 ppm and may consider adopting the ACGIH TLV.
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❓Can exposure be missed with limited sampling?

Yes. BTEX exposure can vary significantly depending on conditions, and limited sampling may not capture peak exposures or variability between workers.

Also the limit of detection for the sampling method may not be able to detect low quantities of benzene, especially during short durations tasks such as changing filters for oil handling process equipment.

❓When should BTEX testing be conducted?

Testing should be conducted when there is potential for exposure, including during oil and gas operations, fuel handling, confined space work, or when air quality concerns are present.
CIH-led BTEX and VOC exposure assessments across Calgary, Alberta, and British Columbia.
updated April 2026
WHS - Occupational Hygienist