Addressing the Revised TLV for Benzene: Industrial Hygiene Challenges in Oil and Gas

Air Sampling for Benzene

The recent reduction of the ACGIH Threshold Limit Value (TLV) for benzene from 0.5 ppm to 0.02 ppm is a significant step forward in worker health and safety. This change particularly impacts federally regulated pipeline companies and oil and gas operations in Calgary and across British Columbia, where WorkSafeBC is in the process of adopting the revised TLV.

​As a certified industrial hygienist with over 20 years of experience, I have conducted extensive air sampling for benzene exposure in workplaces. The findings from recent sampling campaigns highlight the challenges employers face in meeting the updated benzene TLV and ensuring worker protection.
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Key Findings on Benzene Exposure

• Exposure Levels Exceeding the Revised TLV:
  Across various assessments, 8-hour time-weighted averages for benzene frequently range between 0.03 ppm and 0.20 ppm—well above the new TLV of 0.02 ppm. These results underscore the need for proactive strategies to mitigate exposure and protect workers.
• Limitations of Current Air Sampling Instruments:
  • Many direct-reading instruments used for benzene monitoring have detection limits between 30 and 50 ppb. These tools are effective for previous exposure limits but lack the sensitivity to detect levels below 20 ppb.
  • To date, I have not identified any commercially available instruments capable of detecting benzene consistently below 20 ppb, presenting a significant challenge for employers aiming to comply with the revised TLV.
• Challenges in Monitoring Low-Level Exposures:
  Standard NIOSH sampling methods and direct-reading instruments struggle to achieve the accuracy and sensitivity needed for benzene exposure near the updated TLV. Employers must explore advanced sampling strategies to ensure compliance.

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What Does This Mean for Employers in Calgary and Beyond?

• Compliance with the Revised TLV:
  Federally regulated industries and those operating under WorkSafeBC’s jurisdiction will need to re-evaluate their monitoring practices to align with the updated benzene TLV.
• Improved Air Sampling Programs:
  Enhanced air sampling strategies are critical to accurately detect benzene levels below 0.02 ppm. Employers should assess their current programs and consider investing in advanced instruments or consulting experienced industrial hygiene professionals.
• Proactive Worker Protection:
  Beyond regulatory compliance, addressing benzene exposure is an ethical responsibility. Employers must prioritize worker health by implementing robust monitoring and mitigation strategies.

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The Role of Industrial Hygiene in Addressing Benzene Exposure

As an experienced industrial hygienist, I have a deep understanding of the complexities involved in monitoring and mitigating benzene exposure. My fieldwork in Calgary and BC has shown that proactive measures are essential to meet evolving safety standards. Employers should:

• Evaluate current air sampling techniques to ensure accuracy at low detection levels.
• Adapt to evolving standards by implementing effective monitoring programs tailored to specific work environments.
• Engage experts in industrial hygiene to develop practical solutions that safeguard workers and ensure compliance.

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Taking Action

The reduction in the benzene TLV highlights the critical need for updated monitoring practices and a renewed focus on worker safety. Employers in Calgary and BC must address these challenges head-on to ensure compliance and protect their workforce.
If you’re navigating the complexities of the revised TLV for benzene, I’m here to help. Let’s discuss how advanced air sampling strategies and expert guidance can ensure your workplace is safe and compliant.

Call WHS today!