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All materials contaminate, some a little and others much, and together they contribute to a deterioration in the quality of indoor air.

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Even so, many building occupants complain of the quality of the air they breathe and there is therefore a need to investigate the situation.It should also be kept in mind that the perception of an odour may result from the smells of many different compounds and that temperature and humidity may also affect its characteristics.From the standpoint of perception there are four characteristics that allow us to define and measure odours: intensity, quality, tolerability and threshold.This would certainly be true if we were dealing with building materials, furniture and ventilation systems as they were used 50 years ago, when bricks, wood and steel predominated.But with modern materials the situation has changed.

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In order to fully specify the Bayesian network and thus fully represent the joint probability distribution, it is necessary to specify for each node X the probability distribution for X conditional upon X's parents.