Witteveen+Bos carries out measurements to objectively determine the odour concentration from emission sources. We take odour samples at the sites of industrial processes and installations etc. and then determine the odour concentration in the lab. 

The results can be used for odour studies, emission calculations, permit processes and to assess odour nuisance. 

We can determine the total hydrocarbon content (THC) in emissions and air samples. This allows us to assess the scale of a hydrocarbon emission. 

As well as the total hydrocarbon content, we can also measure specific hydrocarbons to produce a more detailed emissions analysis that identifies and quantifies individual compounds. 

Substances of very high concern (SVHCs) demand special attention due to the potential risks to humans and the environment. We can carry out measurements to identify SVHCs in emissions and to determine the concentrations of specific substances. 

For each measurement assignment, we determine the optimal measurement method and strategy for the substance and situation in question. 

Ammonia (NH₃) is an important compound in many industrial and agricultural processes. We can carry out ammonia emission measurements and determine the NH₃ concentration in emissions. 

We adapt the measurement strategy to the source, desired information and objective of the study. 

In our Odour Lab, we analyse the odour samples collected by our measurement team. We do so by diluting the sampled air in an olfactometer (a dilution device) and presenting it to an odour panel.  
 
We offer various sensory analysis techniques and associated services, for example for measurement agencies without their own lab: 

• Determination of the odour concentration (ou_E/m³) in accordance with NEN-EN 13725:2003;
• determination of the (un)pleasantness or hedonistic value of odours in accordance with NEN2818: 2019/2005;
• determination of the odour threshold value of pure aromas or aroma mixtures;
• certification of the olfactory sensitivity of persons (for example employees who carry out complaint verification and/or enforcement) in accordance with NEN-EN 13725.

We advise companies on emission reduction measures. We identify the Best Available Techniques (BATs) and assess which measures are most suitable for the client’s specific situation. This involves considering not just the objective, but also the technical feasibility and cost effectiveness. 

From odour to hydrocarbons, SVHCs, NH₃ and other emissions, we can compare various techniques and measures. Potential solutions include air filters, air scrubbers and other end-of-pipe techniques. 

Because we are not dependent on specific technologies or suppliers, we can issue objective, tailor-made recommendations to suit specific processes, emissions and ambitions.

The Odour Lab is part of the Witteveen+Bos knowledge network. This means that we can combine our odour expertise with other knowledge domains, such as policy and regulations, permit processes and process technology.