Workplace Exposure Monitoring

Exposure monitoring is the measurement and assessment of hazardous substances that workers are exposed to during their normal tasks. It can involve air sampling, surface contamination checks, and biological monitoring, depending on the substance and the route of exposure.

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This process helps determine whether control measures are working effectively and whether exposure is below recognised limits. If results show higher levels than expected, further controls, health surveillance, or biological monitoring may be required.

Exposure to hazardous substances can cause immediate and long-term health problems, including respiratory diseases, skin conditions, and even organ damage. Monitoring provides evidence of actual conditions in the workplace and ensures that control measures are protecting workers as intended.

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Regular monitoring also helps identify failing controls early, preventing harm and keeping your workplace compliant with COSHH and HSE guidelines.

​The main types of exposure monitoring are:

• Air Monitoring - Used to measure the concentration of airborne contaminants such as dusts, fumes, vapours, and gases. Personal air sampling, worn by workers, shows exposure during their usual tasks, while static or fixed-point sampling checks background levels in specific areas.

• Surface Contamination Monitoring - Identifies hazardous residues on work surfaces, tools, or equipment that could transfer to the skin, food, or other areas. Wipe sampling is commonly used for metals, chemicals, and biological agents.

• Biological Monitoring - Tests how much of a substance has entered the body by analysing samples such as urine or blood. This is especially useful when exposure occurs through skin contact or ingestion, or when air monitoring alone cannot provide a full picture.

Exposure monitoring should be done:

• When first introducing a new substance or process

• If there are changes to existing processes or control measures

• After any incident or if workers report symptoms

• At regular intervals to confirm that controls remain effective

Many workplaces choose to review exposure monitoring annually, but high-risk processes may need more frequent checks.

Monitoring is important wherever workers may be exposed to hazardous substances, including:

• Dusts, fumes, vapours, and mists

• Solvents and other chemicals

• Biological agents such as bacteria or moulds

• Activities that create airborne contaminants, like welding, grinding, or spray painting.

The choice of monitoring method depends on the type of hazard and how people are exposed.

At Workplace Scientifics, we don’t just measure exposure - we look at how your processes work and give you clear, practical advice that fits your workplace. Our assessments are thorough, easy to understand, and tailored to your site, so you can trust that the controls we recommend will work in real life.

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We’ll also explain the results clearly, helping you manage risks confidently and protect your team’s health.