A three-dimensional structure that has many points of odour emissions. A typical example is a building where odours emanate from doors, windows, ventilation systems, etc.

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An active source means to have a defined gas flow emitted from a source. As an example, both a biofilter or an aerated pond are both active sources. According to VDI3880, an active source is defined by an average flow velocity of 30m/h or greater over the area of the source. Active sources can be sampled using a sampling hood.

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