Operators sometimes view odour control equipment as too costly or difficult to implement. However, it is often a legal requirement (under environmental permits) to control odour emissions.

Regulators expect operators to use appropriate design, monitoring and management practices to prevent odour nuisance and protect nearby communities.

The good news is that expensive equipment is not always necessary. Many practical steps can reduce emissions before abatement strategies are needed.

This article explains key strategies operators can use to control odour emissions and remain compliant with their environmental permit.

For a full overview of odour regulation and permitting requirements, see our guide on odour management and compliance.

What is Odour Control?

This refers to the methods used to prevent, reduce or manage odour emissions from industrial and commercial activities.

This typically includes:

For a concise overview of practical measures, see our 3 Steps to Effective Odour Control.

The Importance of Odour Control

Regulators expect operators to:

If you fail to control odours, it can lead to:

How to Control Odour Emissions

1. Contain Odour at the Source

The most effective way to control odour is to prevent emissions escaping in the first place.

This often begins with good process design. Whether during initial site development or later upgrades, it is usually easier and more cost-effective to design systems that contain odour emissions at the source. This approach can reduce reliance on costly “end-of-pipe” odour abatement equipment. It also requires less ongoing operational management.

Key containment measures:

Common Sources of Fugitive Odour Emissions:

• Doors, windows and structural gaps

• Accidental ventilation of buildings and storage areas

• Poorly sealed buildings (old and new)

• Badly located ventilation discharge points

• Storage tank “breathing” vents

• Vehicle movements and material handling

If you suspect odour is escaping from buildings or drainage systems, professional smoke testing services can quickly identify leaks and containment failures.

2. Measure & Understand Odour Emissions

You cannot effectively control odour without understanding where it comes from and how it behaves.

Odour Sampling

An odour sampling survey provides quantitative data on emission strength and characteristics. This is essential for:

• Designing odour control systems

• Comparing emission sources

• Supporting compliance

Sniff Survey

Sniff surveys provide a real-world understanding of how people experience odours beyond the site boundary. They are useful for:

• Investigating odour complaints

• Validating dispersion modelling predictions

• Understanding how odours are perceived by nearby receptors

Dispersion Modelling

Odour dispersion modelling predicts how odours could travel and affect surrounding areas. It helps operators:

• Identify high-impact sources

• Test control strategies before implementation

• Prioritise investment

For more depth, read our full guide to odour measurement and how to measure odour.

3. Apply Appropriate Control Methods

After quantifying emissions, operators can implement appropriate control or abatement measures. High-concentration emissions should typically be captured and ducted to abatement systems. For example, biofilters, scrubbers or carbon filters.

Where planning permission allows, improving dispersion (e.g. by increasing stack height) can sometimes reduce the impact of ground-level odours.

Operators should, however, bear future needs in mind. For example, incorporating low-level sampling ports during the design stage will allow easier odour monitoring.

Avoid common mistakes when selecting and operating odour control equipment.

4. Maintain Strong Operational Practices

Technical solutions alone are rarely sufficient. Operators must also adopt robust operational practices and monitoring procedures.

Best practice includes:

• An environmental management system

• A formal odour management plan

• Routine inspections and maintenance

• Staff training and odour awareness

• Clear procedures for responding to complaints or incidents

Operators should also ensure site odour assessors complete sensitivity testing in line with BS EN 13725:2022.

A Practical Approach to Odour Control

To control emissions and maintain environmental permit compliance, operators should:

This structured approach helps demonstrate to regulators that your site is actively managing odour risks and working to prevent nuisance.

For more detailed advice, see the Environment Agency’s guidance on complying with your environmental permit.

Ask for Help to Control Odour Emissions

Finally, if you need support with containing, managing or monitoring your odour emissions, our team can help.

Explore our odour services.

We work with operators across multiple sectors to support practical, compliant odour control strategies.

Call: 01525 860222
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Frequently Asked Questions

Do Environmental Permits Require Odour Control?

Yes. Many environmental permits require operators to prevent odour nuisance and implement appropriate odour management measures. Regulators expect operators to demonstrate that emissions are being effectively controlled.

What is the Best Way to Control Odour Emissions?

The most effective approach combines containment, monitoring, abatement equipment and good operational practices. Together, these measures help operators control odour emissions and minimise off-site impacts.

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