To date, efforts to improve indoor air quality have focused on creating thermal comfort and on developing technical means of reducing odor pollution. These conventional approaches have failed to take account of physiological and psychological effects of the sense of smell. A satisfactory indoor air quality can be achieved only if natural olfactory stimulants with sufficiently positive attributes are added to the indoor air. It is however necessary to set high standards for the use of these olfactory stimulants. Systems are only effective if they ensure that the concentration of olfactory stimulants is kept at just below the perception threshold. It is also critical not to ignore thermal considerations since these may influence the perception of olfactory comfort.
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