static hood

Exposure

Exposure is a combination of the amount of a pollutant in the air and the amount of time that person stays in the presence of a pollutant. Exposure determines the…

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Flux Chamber

In the case of passive sources, a device is required to perform a direct measurement of the source, from either a solid or liquid surface.  Coverings or ‘hoods’ are usually…

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Micrometeorological method

This is an indirect measurement of passive sources where odour emission is determined by measuring wind velocities and concentrations across the plume profile downwind of the source simultaneously.  The turbulent…

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New Source Review (NSR)

A Clean Air Act requirement that State Implementation Plans must include a permit review,  which applies to the construction and operation of new and modified stationary sources in Non-attainment areas, to…

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Odour Source

A location or object that emanates odours.  Sources can be divided by point, area, or volume sources that are of either passive, active or fugitive type.  For example, a rectangular…

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Passive sources

Passive area sources usually and area have no defined flow or a weak flow.  Examples include a waste dump, clarifier or pond.  According to the VDI3880, a passive source has…

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Sampling hood

Is a device used to perform odour measurements on active sources such as biofilters.  It essentially is composed of a conical or pyramidal shape that encloses an area of the…

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Source sampling

The process of obtaining an odourous sample.  Various equipment and standard methods applied depending on the source characteristics.  For example, a passive area will require different equipment for sampling than…

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Static flux hood

In the case of passive sources, a device is required to perform a direct measurement of the source.  Coverings or ‘hoods’ are usually used to achieve this and one such…

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