Relationship Between Concentration and Intensity of Odours for Pig Slurry and Broiler Houses

Odour emissions from poultry litter – A review litter properties, odour formation and odorant emissions from porous materials

“…Intensity is measured using a seven point scale: 0=not detectable, 1=very weak, 2=weak, 3=distinct, 4=strong, 5=very strong, 6=extremely strong. A relationship exists between the concentration of an odour (measured by detection threshold) and its perceived intensity according to the Weber-Fechner or Steven's models (Misselbrook et al, 1993;Ouellette et al, 2010;. The Weber-Fechner model relates odour intensity to the log 10 odour concentration whereas the Steven's model relates odour intensity to odour concentration using a power function .…”

“…The Weber-Fechner model relates odour intensity to the log 10 odour concentration whereas the Steven's model relates odour intensity to odour concentration using a power function . As an example of what exponent may be required for meat chicken farm odours, determined that an exponent of 0.57 was required to relate odour concentration to intensity for pig farm odour, although Misselbrook et al (1993) found that meat chicken farm odours registered a higher intensity score for the same odour concentration compared to pig odours. Ouellette et al (2010) referred to the exponent used in the Steven's model as 'the persistence' because it relates to how much an odour needs to be diluted to effect a change in the intensity.…”

Development and validating procedure of a formula to calculate a minimum separation distance from piggeries and poultry facilities to sensitive receptors

“…Nevertheless, some works aimed at establishing reliable dose-effect relationships (see e.g. Misselbrook et al, 1993;Jiang, 2000;Hayes et al, 2006). Miedema et al (2000) deduced from survey measurements the following relationship between exposure and annoyance.…”

A dispersion modelling approach to determine the odour impact of intensive poultry production units in Ireland

“…Odour intensity is a subjective measurement of the strength and unpleasantness of an odour (Misselbrook et al, 1993). The odour intensity for poultry odour was carried out according to VDI 3882 guidelines (1992).…”

“…The sequence of the presented concentration levels was selected at random. The mean intensity scores from each panellist were obtained at each dilution and the concentration of the odour at each dilution was calculated as the sample concentration divided by the dilution factor (Misselbrook et al, 1993).…”