were insignificantly correlated with the PD of odor intensity as shown in Table 6. However, PD of odor intensity was significantly lower at cold sensation than at neutral sensation with room temperature of 20 1C (p ¼ 0:034). PD of PAQ acceptability was in the range of 3–43%. It was in the range of 30–43% at slightly warm sensation with room temperature of 26 1C and higher than those at cold and neutral sensations. It was insignificantly affected by room air temperature and thermal gradient. However, PD of PAQ acceptability was significantly higher at slightly warm sensation than at neutral sensation with room temperature of 26 1C (po0:001). PD of dry air sensation was in the range of 47–73% and insignificantly affected by thermal gradient and thermal sensation. However, it decreased significantly with increase of room air temperature (p ¼ 0:011). PD of air freshness was in the range of 17–77%. It was especially high in the range of 63–77% at hot sensation with room temperature of 26 1C. It was insignificantly affected by thermal gradient. However, it increased significantly with increase of room temperature (p ¼ 0:012). PD of air freshness was significantly higher at slightly warm sensation than at neutral sensation at room temperature of 26 1C (p ¼ 0:001). In summary, the results indicated that PD of PAQ was insignificantly affected by thermal gradient. PDs of odor intensity and PAQ acceptability were insignificantly affected by room air temperature. However, PD of dry air sensation decreased and PD of air freshness increased significantly with increase of room air temperature. For room temperature of 26 1C, PDs of PAQ acceptability and air freshness were significantly higher at slightly warm sensation than at neutral sensation. PD of odor intensity was significantly lower at cold sensation than at neutral sensation with room temperature of 20 1C.