Wood dust exposure: Are your controls working hard enough?

First things first: Understanding workplace exposure limits (WELs)

Under the Control of Substances Hazardous to Health 2002 (COSHH) Regulations, employers must protect staff from exposure to hazardous substances so far as reasonably practicable.

When dealing with wood dust, this means knowing the maximum concentration of airborne toxins that most people can be exposed to without suffering health issues. This is called the workplace exposure limit (WEL).

• Hardwoods like oak and beech have a higher potential to cause cancer. Their WEL is 3mg/m³.
• Softwoods, such as pine, carry a lower risk. Their WEL is 5mg/m³.
• According to COSHH rules, if wood dusts are combined, you must not exceed the lower WEL.

Assessing and mitigating wood dust risks

To identify wood dust exposure hazards within your business, begin with a detailed COSHH risk assessment by a trusted health and safety partner. The process will cover:

• Measuring the concentration of airborne dusts across various work areas and during high-risk tasks, such as sawing or sweeping.
• Comparing the measured concentrations to the HSE's published WELs for each material.
• Evaluating the duration and frequency of your workers' exposure.

With a data-led summary of your wood dust risks, your consultant will outline ways to prevent particulates from entering and permeating the air. Recommendations may include:

• Install local exhaust ventilation (LEV) on woodworking machines to capture and remove dust at its source.
• Prohibit dry sweeping and compressed air lines within a mill or machining area.
• Instead, provide industrial HEPA filter or M Class vacuums to remove excess wood dust in areas that LEV extensions can't reach.
• Provide appropriate PPE, such as FFP3 masks and gloves, for workers to wear when changing dust bags.
• In addition to using LEV, require employees to use face-fitted respiratory protective equipment (RPE) when sanding.
• Work with an occupational health specialist to implement a health surveillance programme, tracking exposure levels and the early signs of lung ill health.

Maximising wood dust protection

While LEV, PPE, and other controls provide a solid first defence against wood dust exposure, supplemental measures can enhance safety and reduce residual risks. As part of a comprehensive safety plan, these interlinked solutions deliver optimum protection against wood dust hazards:

• Face-fit testing creates a secure seal around the wearer's nose and mouth and is legally required for all workers exposed to hazardous dusts, fumes, mists, gases, or vapours.
• Spirometry is a lung function test used to diagnose and monitor respiratory conditions.
• High-powered dust lamps illuminate airborne particles that are invisible in standard lighting.
• Air purification systems work hand-in-hand with your LEV system, filtering out harmful particles not captured at source.
• Regular equipment maintenance keeps your LEV system in peak condition.
• Hazard-aware housekeeping prevents dust from escaping during clean-up processes.
• Staff safety training ensures every control is used effectively.