site odour assessment

Air quality consultants are frequently called upon to conduct odour assesment when there is a reported odour issue and also with respect to planning. Odour impacts may be assessed for planning applications where a potential odorous activity is carried out.  Such examples are sewerage works, composting, waste recycling, animal remains processing, and other types of solid waste management.

Site odour assessments consider all of the sources of emission of odour in a defined site boundary. These are ranked in order of significance of their individual contribution to the total odour yield. Once these are understood, we are able to recommend the correct control, suppression and abatement solutions.

Close examination of all air emission points is necessary to establish an offending source of odour emissions. This is particularly true of some manufacturing processes where processing units have more than one exhaust point between production areas and the outside air. Manufacturing and processing such as petro-chemical, food processing, chemical and oil refineries have exhaust stacks that can be small and fairly insignificant but that can contribute

Our expert consultant will conduct an initial assessment to identify any possible sources of odour by safely smelling the potential source at each emission point and scoring the source FIDOL index. The FIDOL factors are Frequency, Intensity, Duration, Offensiveness and Location and is used to characterise and score the effects of any possible odour pollution or annoyance.


Frequency – how often an individual is exposed to an odour
Intensity – odour strength as perceived by an individual

Duration – how long the individual(s) were exposed to an odour over time
Offensiveness – the odour’s unpleasantness or hedonic tone (which may be pleasant, neutral or unpleasant)
Location – the type of land use and nature of human activities in the vicinity of an odour source and the tolerance expectation of the receptor.


Determining the odour emissions and source on site before implementing any odour abatement or process control is the most effective, efficient and cost effective means of achieving a successful odour control solution