Odour Concentration

A number of odour units present in one meter cubed at standard conditions. It can only be assessed at 1 OUE/m3. The odour concentration is then expressed as multiples of 1 OUE/m3. For example, an oil pond may have an odour concentration of 5000 OUE/m3. During an olfactometry analysis, the detection threshold is obtained at 1 OUE/m3. The sample was diluted with neutral gas 5000 times and therefore is a multiple of 5000 * 1 OUE/m3= 5000 OUE/m3.