Workplace Exposure Limits (WELs) Testing
- How It Works
- Insights
How It Works
About WEL Testing
Workplace Exposure Limits (WELs) define the maximum legal concentration of airborne substances employees can be exposed to, averaged over a set time.
We start with a site assessment to identify potential exposure risks from substances like dust, fumes, solvents, or chemicals. This helps determine whether extensive monitoring is needed and what strategy suits your organisation best.
Using advanced air sampling, we measure concentrations against EH40/2005 limits — using either an 8-hour Time Weighted Average (TWA) or 15-minute Short-Term Exposure Limit (STEL).
Monitoring can be personal (in the breathing zone) or fixed (at-source and away), in line with HSG173. For high-exposure environments, such as breweries or ironworks, we account for permissible limits based on practicality.
You’ll receive a clear report with findings and mitigation strategies to ensure compliance with COSHH and support a safe, healthy indoor environment.
Service Benefits
- Identify over 500 hazards
- Enhance employee health & saftey
- Vital COSHH compliance
- Evaluate current measures
Insights
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WEL Testing FAQs
What is WEL exposure testing? ↓
WEL exposure testing measures airborne concentrations of hazardous substances in the workplace to ensure they do not exceed workplace exposure limits set by COSHH, with specific amounts outlined in EH40/2005.
Why is WEL exposure testing important? ↓
It identifies potential health risks, ensures legal compliance for employers by meeting COSHH obligations, and helps maintain and improve a safe working environment.
How often should WEL exposure testing be conducted? ↓
Testing frequency depends on the specific workplace environment and the substances in use; general dust and inert compounds may only need assessment every two years. Additionally, if previous surveys show good control of exposure, WEL exposure testing can be less frequent. Regular monitoring on at least an annual basis is recommended to ensure ongoing compliance and safety within COSHHH.
What substances are commonly tested? ↓
Common substances include chemicals, dusts, fumes, solvents, and biological agents.
Is exposure testing a legal requirement? ↓
Yes. Under COSHH regulations, employers must assess and control exposure to hazardous substances. Testing is essential for demonstrating compliance.
Why Choose ARM?
At ARM Environments, we don’t just tick compliance boxes – we specialise exclusively in indoor air quality.
Our team holds SafeContractor and BESA certifications, and our CEO chairs BESA’s IAQ Group – placing us at the forefront of UK standards.
Unlike general hygiene contractors, we focus solely on air quality, giving you sharper insight, more precise monitoring, and practical advice rooted in years of sector-specific expertise.
