Odor samples are evaluated and quantified to determine “odor concentration” (odor strength) using an instrument called an “olfactometer” with an odor panel. These odors are evaluated in accordance with ANSI (American National Standards Institute) and ASTM (American Society for Testing and Materials) standard practices. Specifically, the standard followed internationally for olfactometry is ASTM Standard of Practice E679-91, Determination of Odor and Taste Thresholds by a Forced-Choice Ascending Concentration Series of Limits.