Medical Gas
exposure testing

Repeated exposure to medical gases increases the risk of respiratory issues and central nervous system damage


As an employer, it is crucial to implement effective measures for managing exposure to hazardous substances and safeguarding health. According to the Control of Substances Hazardous to Health Regulations 2002 (as amended), employers must take steps to safeguard the well-being of both employees and others potentially exposed to hazardous substances. This involves the implementation of monitoring procedures to ensure their safety.

In dynamic hospital environments, Sevoflurane and Isoflurane are widely employed in surgical procedures, while dental clinics frequently opt for Nitrous Oxide (Entonox) due to its analgesic properties, leading to regular exposure scenarios.

In hospitals, where intricate surgical procedures are conducted, the EH40 exposure limits are pivotal:

  • Halothane is 82 mg/m3.
  • Enflurane or Isoflurane is 383 mg/m3.

In dental clinics, where unique procedures unfold, the EH40 exposure limit for Nitrous Oxide (Entonox) is crucial at preventing over exposure:

  • Nitrous Oxide is 100 ppm.

The overarching goal is to detect potential breaches of EH40 exposure limits, assess the effectiveness of controls, preventive measures, and maintain a working environment consistently within safe limits.

ActionsActions and advice

The starting point of a workplace exposure assessment in relation to COSHH compliance is to carryout a risk assessment for all substances involved in the process.

Once the hazardous substance(s) have been identified an assessment of exposure levels should be conducted by implementing an exposure testing regime in line with HSG173. The measured exposures should then be compared with the workplace exposure levels (WEL's) as defined by the Health & Safety Executive. Any actions should then be taken to either reduce or control exposure as part of an ongoing monitoring regime.

HelpHow can we help?

Our consultants are here to help you and can develop and implement monitoring strategies to ensure maximum exposure limits are not exceeded with respect to medical gases in the workplace. Our team will advise on appropriate measures to be taken to reduce the risk of exposure to hazardous substances and ensure you comply with the Control of Substances Hazardous to Health regulations.

For further help call us on 0870 7019170 or email:


Knowledge Centre Article

Expand your knowledge on this topic by reading our informative article

Safeguarding Healthcare Workers: Navigating Occupational Exposure to Medical Gases
Safeguarding Healthcare Workers: Navigating Occupational Exposure to Medical Gases


In the ever-evolving healthcare landscape, prioritizing the safety of medical professionals requires a nuanced understanding of the varied applications of medical gases. This expansive article delves into the potential health effects, exposure dynamics, preventative strategies, and the crucial aspect of monitoring exposure levels. Moreover, it explores the diverse contexts where these gases are commonly utilized, ranging from the dynamic environment of hospitals to the more intimate spaces of dental clinics and beyond.

Read More >
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