Employee Exposure Monitoring

What is employee exposure monitoring?

Individual worker exposure monitoring measures the airborne concentration of the hazardous substances each employee encounters in their role that workers may breathe in during normal operations. It quantifies real personal exposure so employers can judge whether existing controls are adequate.

IndustrialAirMonitoring.uk provides independent employee exposure monitoring across manufacturing, construction, chemical, engineering, pharmaceutical sites throughout the UK. Our occupational hygienists deliver defensible exposure data that demonstrates compliance with the Control of Substances Hazardous to Health Regulations 2002 (COSHH) and the workplace exposure limits set out in HSE guidance note EH40.

Why employee exposure monitoring matters

Under COSHH Regulation 10, employers must monitor exposure to hazardous substances where it is needed to protect health, where a workplace exposure limit could be exceeded, or where control measures need to be verified. Individual worker exposure monitoring provides the objective evidence that satisfies this duty.

Uncontrolled exposure to individual worker exposure is linked to occupational illness where individual exposures are uncontrolled. Beyond the legal duty, robust monitoring protects your workforce, reduces the risk of enforcement action and civil claims, and gives insurers and clients confidence that exposure is being actively managed.

How we carry out employee exposure monitoring

We measure exposure using personal breathing-zone sampling assigned to representative employees within similar exposure groups, following the recognised BS EN 689 / COSHH methodology. Personal samplers are worn in the breathing zone for a representative full shift to derive an 8-hour time-weighted average, while static (background) samples help map contaminant sources across the workplace.

Samples are analysed by an accredited laboratory and the results compared with the relevant occupational exposure limit. Where short-term peaks are a concern we add 15-minute short-term exposure limit (STEL) sampling, so both the chronic and acute risk picture is captured.

Standards, limits and reporting

Individual worker exposure is controlled to as low as is reasonably practicable, with sampling benchmarked against published occupational and in-house standards. We assess compliance using the BS EN 689 statistical decision framework, which accounts for exposure variability rather than relying on a single result.

Your report sets out the measured concentrations, the compliance position, the adequacy of existing controls such as local exhaust ventilation, and a recommended re-monitoring interval. It is written to be understood by managers and to satisfy HSE inspectors, auditors and insurers.

Our employee exposure monitoring process

Our employee exposure monitoring programmes follow a structured, four-stage workflow so the results stand up to scrutiny. Request monitoring or book a site assessment to begin.

1Scoping & site survey. We review your processes, COSHH assessments and previous employee exposure monitoring data, then plan a representative sampling strategy using BS EN 689 similar exposure groups.
2On-site sampling. Qualified occupational hygienists carry out calibrated breathing-zone and static measurements across a representative shift, with full chain-of-custody documentation.
3Accredited analysis. Samples are analysed using the relevant MDHS / ISO laboratory method and the results are compared against the applicable workplace exposure limit.
4Reporting & recommendations. You receive a clear exposure report with compliance status, control recommendations and a re-monitoring interval — defensible evidence for HSE, insurers and auditors.

Frequently asked questions

Does every employee need monitoring?

No — workers are grouped into similar exposure groups and a representative selection is sampled, which reliably describes the whole group.

How does this support health surveillance?

Exposure records sit alongside health surveillance to demonstrate due diligence and to interpret any health findings.

How long are exposure records kept?

Personal exposure records are generally retained for at least 40 years where linked to health records; we format reports for long-term retention.