Bakeries: flour dust in older premises

Because it is a respiratory sensitiser - repeated breathing of flour dust can sensitise a baker's airways, causing baker's asthma (one of the most common occupational asthmas in the UK); once sensitised, they react to even small amounts, often permanently, ending their baking career. Flour dust is a health hazard because it is a respiratory sensitiser - a substance that can sensitise the airways so the person reacts to it. Repeated breathing of flour dust can sensitise a baker's airways over time, leading to baker's asthma, one of the most common forms of occupational asthma in the UK. Once someone is sensitised, they can react to even small amounts of flour dust - asthma attacks, wheezing, breathing difficulty - and the sensitisation is usually permanent. So a baker who develops baker's asthma often can't keep working with flour (even small exposures trigger it), which can end their career. This is why flour dust is serious rather than a trivial nuisance - it's a leading cause of a serious, potentially career-ending occupational disease. The dust doesn't have to be visibly thick to sensitise; ongoing airborne exposure is the risk. So it's a hazard because it can permanently sensitise the airways and cause baker's asthma. So because it causes baker's asthma. This is general information, not clinical advice. This is general information.

Yes - flour dust is a hazardous substance under COSHH, with a workplace exposure limit (a long-term shift limit and a short-term fifteen-minute limit); employers must prevent or adequately control exposure and keep it as low as reasonably practicable, as it's a sensitiser. Yes - flour dust is covered by COSHH (the Control of Substances Hazardous to Health Regulations). Because it's a respiratory sensitiser, it's a hazardous substance under COSHH, and it has a workplace exposure limit (WEL): a long-term limit measured as an average over a working shift, and a short-term limit measured over a fifteen-minute period, both set to protect health. COSHH requires the employer to prevent or adequately control exposure to flour dust, and - because it's a sensitiser - to keep it as low as reasonably practicable, not just below the exposure limit. So a bakery has a positive legal duty to control flour dust, through a COSHH assessment identifying the dusty tasks and the controls needed. Meeting the exposure limit is a minimum, not the goal; the goal is exposure as low as reasonably practicable. So yes - flour dust is firmly within COSHH, and must be properly controlled. So yes; it's a COSHH substance with an exposure limit. This is general information, not a COSHH assessment. This is general information.

LEV captures the flour dust at source - at the dusty tasks like tipping, weighing, sieving and mixing - drawing it away before bakers breathe it; as an engineering control it protects everyone in the area, not just a mask-wearer, which is why it's the key measure. LEV (local exhaust ventilation) helps control flour dust by capturing it at source. It's positioned at the dusty tasks - the tipping and weighing station, the mixer, the dusty bench - to draw the flour dust away as it's generated, before it reaches the baker's breathing zone or spreads through the bakery. This makes it the key engineering control for flour dust, because it removes the dust at the point it's created, protecting everyone in the area - not just someone wearing a mask. In the hierarchy of control, LEV sits after reducing dust generation (low-dust handling, not dry-sweeping) and before respiratory protection (masks, used on top where LEV can't fully control a task). So the layered approach is: reduce the dust made, capture what's made with LEV, and protect with RPE where needed - with LEV doing the main work of removing airborne dust. LEV only protects while it's working, which is why it's tested regularly. So LEV draws the dust away at source, protecting the whole area. So it captures the dust before bakers breathe it. This is general information. This is general information.

For most systems, at least every fourteen months - the standard thorough examination and test interval under COSHH (some processes need it more often); the test confirms the extraction is still capturing the flour dust, because an LEV system can degrade and stop working while still running. A bakery's LEV should be thoroughly examined and tested at least every fourteen months for most systems - the standard interval under COSHH for LEV thorough examination and testing (some higher-risk processes need it more frequently, and the assessment sets the interval). The test matters because an LEV system can degrade over time - a weakening fan, a clogging filter, a blocked or leaking duct - and stop capturing the flour dust effectively while still appearing to run. So without testing, a bakery could be relying on LEV that's no longer controlling the dust, without knowing. The thorough examination and test confirms the extraction is genuinely capturing the flour dust as it should - measuring the airflow and capture, checking the system's condition, and confirming it meets its performance requirements. So it's the check that proves the flour-dust control (which the bakery relies on to protect bakers from a sensitiser) is still working, not just present. For an older system especially, that regular confirmation is essential. So at least every fourteen months, by a competent person. So typically at least every fourteen months. This is general information. This is general information.

Because they're often tighter and more crowded (extraction harder to position, dust spreads more), the extraction is older, undersized or piecemeal (capturing dust less well and more likely degraded), years of flour dust are settled into the fabric, and the layout wasn't designed for dust control - so good, tested LEV matters more. Older bakery premises make flour-dust control harder for several reasons. Space: older bakeries are often tighter and more crowded, so extraction is harder to position well and dust spreads more easily in the confined space. Older extraction: the LEV may itself be old, undersized, or added piecemeal over the years, so it may not capture the dust effectively - and being old, it's more likely to have degraded. Settled dust: years of flour dust can be settled into the fabric of an old bakery - surfaces, ledges, beams, the structure - which gets disturbed and re-raised into the air. And layout: old buildings weren't designed around modern dust control, so the extraction may not suit the layout or reach the dusty tasks well. So in an older bakery, the building works against effective dust control, which means good, well-tested LEV matters even more - the extraction has to work harder, so it's especially important it's well-designed for the premises and confirmed to be working. This makes regular LEV testing particularly important in older premises. So older premises stack the odds against control, so the LEV must work harder and be proven. So because the building itself makes control harder. This is general information. This is general information.

Have a COSHH assessment identifying the dusty tasks; reduce dust generation, use LEV to capture dust at the dusty tasks, and use RPE where needed; keep the LEV thoroughly examined and tested (typically at least every fourteen months); and take extra care in older premises where control is harder. A bakery should control flour dust systematically under COSHH. Start with a COSHH assessment: identify the dusty tasks (tipping, weighing, sieving, mixing, dusting, cleaning) and the exposure, and decide the controls needed. Then control the dust following the hierarchy: reduce dust generation where possible (low-dust handling, careful tipping, not dry-sweeping); use local exhaust ventilation (LEV) to capture the dust at the dusty tasks, drawing it away at source; and use respiratory protection (suitable, face-fit-tested masks) where needed on top. Keep the LEV working: it must be thoroughly examined and tested regularly (typically at least every fourteen months) to confirm it's still capturing the dust, and maintained between tests. Consider health surveillance for bakers (to catch early signs of sensitisation). And in older premises, take extra care - the tighter space, older extraction and settled dust make control harder, so good, well-tested LEV matters more. So the actions are: assess, control (reduce, LEV, RPE), test the LEV, and surveil health - with extra attention in older premises. So assess it, control it with LEV, and test the LEV. This is general information, not a COSHH assessment - get professional advice. This is general information.