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n-butanol

is the reference material outlined in the EN13725 standard.  One of the criteria in order to become an assessor, is to be able to detect n-butanol between 20ppb to 80ppb…

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Neutral gas

Gas (air or nitrogen) not having any odour that would interfere with olfactometry measurement.  Clean odourless air is used during an olfactometry analysis.  Activated carbon filters may be used to…

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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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