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The assessor is presented with two or more ports, of which one presents the stimulus and the other(s) neutral gas. The location of the stimulus in the consecutive presentation is randomly distributed over the two or more ports. The assessor is asked to indicate which of ports is the one with the stimulus. When the assessor expresses doubt, he/she is asked to indicate a port ” at random”. To reduce variability and achieve convergence with the yes/no choice mode, the following procedure is applied to distinguish False from True responses. The assessor is asked whether his/her choice was a guess, an inkling or certain. From the combination of the choice result and the indicated level of certainty, the response is classified to be False or True.

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The assessor is asked to evaluate gas presented from a specific port and to indicate if an odour is perceived (YES/NO). The assessor is aware that in some cases blanks (only neutral gas) are presented. A second part always presenting neutral gas may be made available to the assessor to provide a reference.

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An odour analysis method where an assessor determines whether an odour is perceived from a specific port to measure odour concentration. The assessor is asked whether they detect an odour and is expected to respond ‘yes’ or ‘no.’  Blanks may be used.

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A federal law passed in 1970 and amended in 1974, 1977, and 1990 which forms the basis for the national air pollution control effort. Basic elements of the act include national ambient air quality standards for major air pollutants, mobile and stationary control measures, air toxics standards, acid rain control measures, and enforcement provisions.

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Exposure is a combination of the amount of a pollutant in the air and the amount of time that a person stays in the presence of a pollutant. Exposure determines the level of risk associated with different levels of pollutants.

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