Dynamic Dilution Olfactometry is based on dilution to the threshold of a gas sample with multiple components. Odour threshold is a commonly used term. It is the minimum concentration detectable or the minimum detectable difference between two concentrations.

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A ratio of diluting neutral gas to odorous sample gas.  According to ASTM E679, this is a ratio of diluting gas to the odour sample. According to EN13725, this is a ratio of the sum of the diluting gas and odour sample, to the odour sample.  It is calculated based on the flow rate.

Example

5 parts of diluting air to 1 part of sample

ASTM E679:  Diluting gas/odourous sample = 5:1 = 5

EN 13725:  (diluting gas + odourous sample)/odourous sample = 6:1 = 6

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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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