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-�. -- with two nasal ports on one end and six inlets for the odorous air (inlet sizes of 1/32" (0.08 cm), 1/16" (0.16 cm), 1/8" (0.32 cm), 3/16" (0.48 cm), 1/4" (0.64 cm), and 1/2" (1.27 cm)) at the other end which are connected to a mixing chamber. These inlets correspond to 350 D/T, 170 D/T, 31 D/T, 15 D/T, 7 D/T, and 2 D/T respectively. D/T values are measured with all but one of the 6 odorous air inlets closed, and the size of the open inlet determines the dilution of the odorous air. For example, if a threshold is found with the 1/16" inlet open, the concentration of the odor was considered to be 170 times above threshold. In addition to the Scentometer, the Nasal Ranger� olfactometer was used by the odor panel to assess odor thresholds at each location. This olfactometer is a hand-held device which has a dial that can be turned to deliver blank air (air that is only drawn through a filter) or to deliver air at the D/T levels of 2, 4, 7, 15, 30, and 60. The presentation device is the AC'SCENT� SWIFTTM Nasal Mask. This olfactometer which insures a specific flow rate of 14-18 liters per minute was used in conjunction with the Scentometer for consistency of ineasurements. After threshold determinations, subjects rated each ambient air sample on 9-point scales for odor intensity, nasal irritation, and pleasantness/unpleasantness, and provided a description of the odor. The scales used for odor intensity, nasal irritation, and pleasanmess are given below: Scale Odor lntensity Irritation Intensity Pleasantness 8 Maximal � Maximal � Extremel Un leasant 7 Ve Stron Ve Stron Ve Un leasant 6 Stron Stron Moderatel Un Ieasant 5 Moderatel Stron Moderatel Stron Sli htl Un leasant 4 Moderate Moderate Neutral 3 Moderatel Weak Moderatel Weak Sli htl Pleasant 2 Weak Weak Moderatel Pleasant 1 Ve Weak Ve Weak Ve Pleasant 0 None at all None at all Extremel Pleasant Subjects also provided a description of the odor of each ambient air sample. Subjects utilized adjectives based on 146-odor descriptive scales developed by the American Society far Testing and Materials (see ASTM, 1984, 1992). If a subject wanted to include in the description of a sample, an odor which is not present among the 146 odor terms, he or she provided other words and/or phrases to describe that odor. Subjects rated at least the odor intensity and nasal irritation based on their iirst whiff of the sample, and then subsequent whiffs were taken to complete the evaluation of each sample. Results Table 1 gives the mean odor intensiry ratings for all locations at PetSmartlPetHotels in Cary and Raleigh along with mean odor intensity ratings from other commercial locations in the Cary/Raleigh community. The mean odor intensities, mean irritation intensities, and hedonic ratings (pleasanmess to unpleasantness) for each day of testing at the two sites (for a115 panelists) are given in Tables 2, 3, and 4. These ratings are represented graphically in Figures 1,