Knowing the Workplace Exposure Limits (WELs)

Posted by Emma Curthoys

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Knowing the Workplace Exposure Limits (WELs)

Workplace exposure limits (WELs) are legal standards that set maximum permissible concentrations of hazardous substances in the air that workers can be exposed to during their workday. These limits are crucial for protecting the health and safety of employees.

Why Are WELs Important?

Exposure to hazardous substances can have serious health consequences, including:

Respiratory problems (e.g., asthma, bronchitis)
Cancer (e.g., lung cancer, mesothelioma)
Skin diseases (e.g., dermatitis, eczema)
Reproductive issues (e.g., infertility, birth defects)

That’s why it is so crucial that WELs be put in place, to try and mitigate the risks involved with exposure. By setting and enforcing WELs, the UK government aims to prevent occupational diseases, improve the overall health and well-being of workers, and protect the environment.

Types of Workplace Exposure Limits

Workplace Exposure Limits are divided into two categories –

Short-term exposure limit (STEL): Designed to protect workers from acute health effects that may occur from brief exposures to hazardous substances. STELs typically measure exposure over a 15-minute period.

Long-term exposure limit (LTEL): LTELs are intended to safeguard workers from chronic health issues that can arise from prolonged exposure to hazardous substances. They measure exposure over an eight-hour workday.

Factors Affecting WELs

The specific workplace exposure limit (WEL) for a particular substance can be influenced by various factors. The toxicity and potency of the substance play a significant role in determining the WEL. Additionally, the route of exposure, whether through inhalation, skin absorption, or ingestion, affects the associated health risks. The duration of exposure to a hazardous substance can also impact the severity of health effects. Furthermore, the potential for serious health consequences, such as cancer or reproductive harm, will influence the WEL.

Adhering to WELs

Employers have a legal obligation to ensure that their employees are not exposed to hazardous substances above the workplace exposure limits (WELs). This involves conducting risk assessments to identify potential hazards and evaluate their associated risks. To reduce exposure, employers must implement control measures such as engineering controls (e.g., ventilation), administrative controls (e.g., job rotation), and personal protective equipment (e.g., respirators, gloves).

Additionally, regular monitoring of exposure levels is necessary to measure the concentration of hazardous substances in the workplace air. Finally, employers must provide training to educate employees about the risks of exposure, the control measures in place, and their responsibilities in complying with health and safety regulations.

Resources for further information

If you have questions about workplace exposure limits or need more information, you can consult the following resources:

Health and Safety Executive (HSE): The HSE is the UK’s leading health and safety regulator. They provide guidance and advice on workplace exposure limits and other health and safety matters.

Click here to visit the HSE website

British Occupational Hygiene Society (BOHS): BOHS is a professional body for occupational hygienists. They offer training, qualifications, and resources related to workplace exposure control.

Click here to visit the BOSH website