Olfactory perception, or whether an odor is perceived as “desirable” or “undesirable”, largely depends on a sense of each person ; many studies have shown that performance of olfactory organs vary with each individual. Although the mechanism of olfactory perception system has not yet been completely explained, it is gradually being revealed : Linda B. Buck and Richard Axel, who were awarded the Nobel Prize in 2004, found some specific genes that are connected to olfactory reception, while some other studies are tackling the issue from the gustatory sensation aspect.
In the recent years, in response to the increase of odor complaints, odor control enactment is increasing in Japan primarily from manufacturing plants in the secondary industries. As the Japan Offensive Odor Control Act develops, the basis of the regulation shifted from the malodorous component control to olfactory measurement (sensory evaluation ; odor index) : By the end of March 2008 total 351 local governments, which is 26.9% of total areas which are subject to regulation, introduced the odor index system.
The Japan Ministry of Environment and the Association on Odor Environment are working for improving the odor environment, not only by preventing undesired odors but also by means of a new, citizen-driven way of town planning, utilizing senses of temperature, light, odor and sound of the inhabitants. It is expected that the tertiary industries or service industries will be subject to odor regulations by local governments in the future, like Yokohama and Kobe, and this tendency will surely have a big impact on the future town planning.
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