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odor threshold

In principle, the lowest concentration of an odorant in the air that can be detected by a human being.

Note: In practice, a panel of “sniffers” is often used, and the threshold taken as the concentration at which 50% of the panel can detect the odorant (although some workers have also used 100% thresholds). The odor concentration at the detection threshold may be defined as one odor unit.

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