Aluminium is one of the most widely used metals in modern industry. It’s light, strong and resistant to corrosion. It can be found in everything from components and machinery to structural materials and specialist products. A sheet of aluminium sitting on a workbench is unlikely to present a hazard, however fine particles created when the material is processed can cause serious health problems.
What happens when aluminium is inhaled or swallowed?
Fine dust can travel into the respiratory system, particularly when work generates particles small enough to remain airborne. Respiratory irritation may cause coughing, throat irritation, chest discomfort or breathing difficulties. Welding adds another layer to the problem because the fume is a mixture of very fine particles and gases. The HSE identifies welding fume as a cause of occupational lung disease and highlights an increased risk of asthma and cancer among workers whose exposure is not properly controlled.
Ingestion is less common but can happen through poor workplace hygiene. Dust can settle on, clothing, equipment and surfaces. Eating, drinking or smoking without washing the hands properly can then transfer contaminants into the mouth. Good hygiene is therefore non-negotiable. Keeping food and drink away from contaminated areas, washing hands before breaks and maintaining suitable workplace cleanliness reduces unnecessary exposure.
What illnesses can occupational exposure cause?
The health effects associated with aluminium depend on the level, duration and form of exposure. In the short term, workers may experience respiratory irritation such as dryness of the throat, coughing and chest tightness. However, over time this can lead to chronic respiratory issues such as aluminium pneumoconiosis and “pot room asthma”.
Metal fume fever is an occupational illness associated with hot metal work. Workers can develop flu-like symptoms several hours after exposure to particular metal fumes. The condition is usually temporary, but repeated exposure is a sign that workplace controls need examining.
Neurological effects have also been investigated in workers with aluminium exposure. Some research has found associations between prolonged exposure and changes in cognitive performance, including attention, memory and processing speed. However, the evidence is not straightforward and studies have reported limitations and conflicting findings.
There are also long term concerns surrounding occupational lung disease. Welding fume exposure has been associated with chronic bronchitis, chronic obstructive pulmonary disease and lung cancer. The risks do not come exclusively from aluminium itself. Welding fume is chemically complex, meaning the metal being welded and the process being used both matter.
What about pregnant workers?
The evidence surrounding aluminium and pregnancy is not sufficiently clear to say that normal controlled workplace exposure will cause harm to an unborn child. Research has nevertheless examined the possibility of reproductive and developmental effects associated with aluminium exposure, which is why exposure should be assessed carefully rather than dismissed.
A pregnant worker should be encouraged to speak to their employer or occupational health professional if they are concerned about exposure. The appropriate response is usually a review of the individual risk assessment and the effectiveness of existing controls, rather than automatically removing the worker from their role.
What are the workplace exposure limits for aluminium?
In Great Britain, the HSE’s workplace exposure limits specify an eight hour time weighted average limit of 10 mg/m³ for inhalable aluminium metal dust, and 5mg/m³ for aluminium welding fumes. These figures are important, because under COSHH regulations employers must prevent exposure where reasonably practicable and adequately control exposure where prevention is not possible. It is also worth remembering that a welding operation may expose workers to substances other than aluminium. The relevant exposure limits therefore depend on the actual materials and processes being used.
How can employers control aluminium exposure?
The best approach is to prevent or reduce exposure at its source. This begins with a COSHH assessment, which should consider how aluminium is being used, if contaminants are produced and how they can be exposed. Where possible, employers should consider whether a different process can reduce the amount of dust or fume produced. For welding, the HSE recommends considering alternative or lower fume processes before relying on respiratory protection. Local exhaust ventilation can capture contaminants close to where they are generated, preventing them from reaching the worker’s breathing zone.
Respiratory protective equipment plays a role when other controls cannot provide sufficient protection. However, a mask should not be regarded as a substitute for effective extraction. Equipment needs to be suitable for the task, correctly fitted and properly maintained. Training matters too. Workers should understand the risks associated with their particular process and know how to use extraction, PPE and RPE correctly.
How can health surveillance protect workers?
Health surveillance provides another opportunity to identify work related health problems before they become more serious. Depending on the risk assessment, this can involve asking workers about respiratory symptoms and monitoring changes in their health. For workers involved in processes that generate hazardous dust and fumes, health surveillance can help identify symptoms consistent with respiratory illnesses at an early stage. Health surveillance can provide an early warning that something in the workplace needs to change.
Working with aluminium safely
Aluminium has an important place in modern manufacturing and engineering, but its benefits should not distract from the need to control hazardous exposure. Solid aluminium, aluminium dust and aluminium welding fume are not the same threat, and the risks depend heavily on the process being carried out. The most effective workplaces deal with exposure at its source, ensuring that workers can process aluminium without having to trade their long term health for the demands of the job.