HSE Flour Dust Guidance Series – Controlling Exposure in Bakeries and Flour Mills

Practical Guidance for Preventing Occupational Asthma and Flour Dust Exposure

The HSE Flour Dust Guidance Series (FL Series) provides practical task-specific guidance for controlling exposure to flour dust and baking ingredients within bakeries, flour mills and food manufacturing environments.

Produced as part of the HSE COSHH Essentials programme, the guidance focuses on one of the most significant occupational health hazards encountered within the food manufacturing industry: flour dust. Exposure to flour dust and baking enzymes remains one of the leading causes of occupational asthma in the United Kingdom and continues to be a major area of regulatory attention for the Health and Safety Executive (HSE).

The guidance provides practical control measures for the activities most commonly associated with dust generation and worker exposure.

The series covers:

Bag opening and ingredient tipping
Dough mixing operations
Flour improvers and additives
Dough moulding and dividing
Flour bagging
Flour milling activities
Bulk ingredient systems
Dry ingredient dispensing systems
Local Exhaust Ventilation (LEV)
Housekeeping and cleaning
Health surveillance
Occupational asthma prevention

This resource is relevant to:

Occupational Hygienists
LEV Designers/Commissioners/Tester
Bakery Managers
Food Manufacturing Managers
Flour Mill Operators
Health & Safety Professionals
Duty Holders

Source Document

View the HSE guidance here:

View Original HSE Guidance

Source: Health and Safety Executive (HSE)
Document Type: FL Series – Flour (Bakers and Millers)
Status: Current
Last reviewed by LEVCentral: June 2026

LEVCentral Expert Commentary

The HSE Flour Dust Guidance Series remains one of the most important occupational hygiene resources available to the food manufacturing sector.

Flour dust is often perceived as a relatively harmless nuisance dust because it is associated with food production. However, from an occupational hygiene perspective, flour dust is a respiratory sensitiser capable of causing occupational asthma, one of the most common occupational lung diseases still encountered in the UK.

The consequences can be significant. Once a worker becomes sensitised, even relatively low levels of exposure may trigger symptoms. In many cases the condition is irreversible and may prevent an individual from continuing to work in the industry.

One of the strengths of the FL Series is its task-based approach.

Rather than providing generic advice, the guidance focuses on specific bakery activities where dust generation commonly occurs. This aligns closely with modern occupational hygiene practice, where understanding the exposure source is often more important than understanding the material alone.

The guidance also reinforces an important principle frequently overlooked within industry:

Flour dust should be prevented wherever possible, not simply extracted after it has become airborne.

The hierarchy of control remains central to HSE expectations. Employers should first consider elimination and substitution before relying on engineering controls such as LEV and, ultimately, respiratory protective equipment.

This approach has become increasingly relevant as HSE has renewed its focus on bakery inspections and flour dust exposure management. Recent inspection campaigns have specifically targeted occupational asthma prevention, exposure control and health surveillance arrangements.

For LEV professionals, the guidance provides an excellent example of how engineering controls should be integrated with process design, housekeeping, worker training and occupational hygiene programmes.

Key Learning Points

Flour Dust Is a Major Cause of Occupational Asthma

Flour dust and baking enzymes remain among the leading causes of occupational asthma in the UK food manufacturing sector.

Exposure Should Be Prevented Before It Is Extracted

The HSE places significant emphasis on elimination and substitution before engineering controls are considered.

LEV Is Often Essential for Dusty Processes

Many bakery operations require effective extraction systems to prevent flour dust entering workers’ breathing zones.

Housekeeping Has a Major Impact on Exposure

Dry sweeping and compressed-air cleaning can significantly increase airborne dust levels and should be avoided.

Health Surveillance Remains Critical

Early identification of respiratory symptoms helps organisations determine whether control measures are working effectively.

HSE Guidance Sheets Included Within the Series

FL1 – Bag Opening, Tipping and Dough Mixing

Guidance on controlling flour dust generated during ingredient tipping, bag handling and dough mixing operations.

FL2 – Weighing and Handling Flour Improvers

Control measures for handling powdered improvers, additives and other bakery ingredients.

FL3 – Dough Moulding and Dividing

Practical methods for reducing dust generation during dough processing operations.

FL5 – Flour Bagging

Guidance on controlling dust exposure during packing and bagging activities.

FL6 – Manual Addition of Bulk Improvers to Flour

Advice on minimising exposure when handling bulk additives and improvers within flour milling operations.

FL8 – Stand-alone Dust Collector

Guidance on bulk ingredient systems, filtration and the recirculation of filtered air back into the workplace.

Together these guidance sheets provide a practical framework for managing flour dust exposure across bakery and flour milling operations.

Why This Guidance Remains Important

Despite decades of awareness, flour dust continues to cause occupational asthma and respiratory sensitisation within bakeries and food manufacturing environments.

The HSE has recently launched targeted inspection programmes focused specifically on flour dust exposure and occupational asthma prevention, demonstrating that the issue remains a significant regulatory concern.

The guidance therefore remains highly relevant for organisations seeking to:

Improve occupational health performance
Comply with COSHH requirements
Reduce occupational asthma risks
Improve LEV effectiveness
Demonstrate good exposure-control management

Further Resources

Recommended Learning

Thought Leadership

LEVCentral Observation

The HSE Flour Dust Guidance Series demonstrates that some of the most significant occupational health risks arise from materials that appear relatively harmless.

Flour is a food ingredient, yet inhalation of airborne flour dust can result in life-changing respiratory disease. The guidance highlights the importance of understanding how exposure occurs, applying the hierarchy of control and verifying that engineering controls remain effective.

For LEV professionals and occupational hygienists alike, the FL Series remains an excellent example of practical exposure-control guidance built around real workplace activities.