Understanding the Risks of Diesel Exhaust Emissions and How to Control Them

Diesel Exhaust Emissions (DEEEs) are a mixture of gases, vapours and microscopic particles released whenever a diesel engine is running. These emissions can quickly accumulate inside workshops, garages, depots and other enclosed spaces if they are not effectively removed.

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Because many of the smallest particles are invisible to the naked eye, employees may be exposed without realising it.

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At A-Mac Environmental, we design, install, test and maintain Local Exhaust Ventilation (LEV) and vehicle exhaust extraction systems that capture diesel exhaust emissions at source, helping businesses improve workplace air quality and support compliance with UK health and safety legislation.

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What are Diesel Exhaust Emissions?

Diesel exhaust emissions are produced whenever diesel fuel is burned in an engine.

They contain a complex mixture of airborne contaminants, including:

• Fine particulate matter (diesel soot)

• Carbon monoxide (CO)

• Nitrogen oxides (NOx)

• Carbon dioxide (CO₂)

• Hydrocarbons

• Other combustion by-products

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The composition of the exhaust depends on factors such as engine condition, fuel type, maintenance and operating conditions.

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Where are Diesel Exhaust Emissions Found?

Employees may be exposed in many workplaces, including:

• Vehicle repair workshops

• MOT testing stations

• HGV maintenance depots

• Bus and coach depots

• Agricultural machinery workshops

• Construction equipment workshops

• Fire stations

• Emergency service vehicle depots

• Warehouses where diesel-powered equipment is used

• Distribution centres

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Any enclosed space where diesel engines are operated should consider suitable exhaust extraction measures.

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Why are Diesel Exhaust Emissions Hazardous?

Without effective control, repeated exposure to diesel exhaust emissions can affect employee health.

Possible health effects include:

• Eye irritation

• Nose and throat irritation

• Coughing

• Respiratory irritation

• Headaches

• Aggravation of existing respiratory conditions

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Long-term exposure to diesel exhaust emissions has also been associated with more serious health risks, making effective control an important part of workplace safety.

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How Can Diesel Exhaust Emissions Be Controlled?

The most effective way to protect employees is to capture exhaust emissions directly from the vehicle before they enter the workplace atmosphere.

Common control measures include:

• Vehicle exhaust extraction systems

• Tailpipe extraction

• Exhaust hose reels

• Rail-mounted extraction systems

• General ventilation to support extraction

• Good housekeeping

• Safe working practices

• Limiting unnecessary engine idling

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Engineering controls should always be considered before relying on personal protective equipment.

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The Importance of Vehicle Exhaust Extraction

A properly designed vehicle exhaust extraction system removes emissions directly from the vehicle's exhaust pipe before they spread through the workshop.

An effective system can help:

• Improve workplace air quality

• Reduce employee exposure

• Improve visibility

• Reduce lingering exhaust odours

• Support compliance with COSHH Regulations

• Create a cleaner and healthier working environment

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Every workshop is different, so extraction systems should be designed around the vehicles, building layout and working practices.

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Maintaining Vehicle Exhaust Extraction Systems

Installing an extraction system is only the beginning.

To continue operating effectively, systems should be:

• Inspected regularly

• Serviced in accordance with manufacturer recommendations

• Checked for airflow performance

• Maintained to ensure hoses and connections remain in good condition

• Subject to a Thorough Examination and Test (TExT) where applicable

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Routine maintenance helps ensure reliable extraction and long-term performance.

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Industries That Require Exhaust Extraction

Vehicle exhaust extraction systems are commonly used in:

• Automotive workshops

• Commercial vehicle maintenance

• Bus depots

• HGV workshops

• Agricultural engineering

• Construction plant maintenance

• Fleet maintenance facilities

• Fire stations

• Local authority depots

• Emergency service workshops

• Defence vehicle workshops

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Where diesel-powered vehicles are operated indoors, effective extraction should always be considered.

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How A-Mac Environmental Can Help

A-Mac Environmental provides complete vehicle exhaust extraction and LEV solutions throughout Scotland.

Our services include:

• Vehicle exhaust extraction system design

• Tailpipe extraction systems

• Exhaust hose reels

• Rail-mounted extraction systems

• Local Exhaust Ventilation (LEV)

• LEV Thorough Examination and Test (TExT)

• Planned preventative maintenance

• Repairs and upgrades

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Our qualified P601 and P602 engineers work with businesses of all sizes to deliver reliable extraction systems that improve workplace air quality and support compliance.

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Frequently Asked Questions

 

Are diesel exhaust emissions hazardous?

Yes. Diesel exhaust emissions contain gases and fine airborne particles that should be effectively controlled to reduce employee exposure.

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Is vehicle exhaust extraction a legal requirement?

Employers have a duty under the Control of Substances Hazardous to Health (COSHH) Regulations to prevent or adequately control exposure to hazardous substances where reasonably practicable. Vehicle exhaust extraction is often an effective engineering control in workshops where diesel vehicles are operated indoors.

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Can opening workshop doors replace exhaust extraction?

No. Opening doors may improve general ventilation, but it does not capture diesel exhaust emissions at the source. Vehicle exhaust extraction systems are specifically designed to remove emissions before they spread throughout the building.

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How often should exhaust extraction systems be tested?

Where the system forms part of an LEV installation, a Thorough Examination and Test (TExT) is generally required at suitable intervals, with many systems requiring examination at least every 14 months.

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Can existing exhaust extraction systems be upgraded?

Yes. Older systems can often be upgraded with new hose reels, extraction nozzles, fans or ductwork to improve performance and meet the changing needs of your workshop.

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If your workshop, depot or maintenance facility operates diesel-powered vehicles indoors, A-Mac Environmental can help you improve workplace air quality and reduce employee exposure to diesel exhaust emissions.

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Our experienced engineers provide professional vehicle exhaust extraction, LEV design, Thorough Examination and Test (TExT), maintenance and repairs throughout Scotland.

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Contact A-Mac Environmental today to arrange a site survey or discuss the most effective exhaust extraction solution for your business.