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To improve vihicle compartment comfort, there has been a great demand for the development of odor filters which reduce odors, especially external diesel exhaust odors. Therefore, in efficiently developing cabin air filter combining dust removal and deodorant functin, a quantitative formula which enables acquisition of the correlation between sensory evaluation values and instrumental analysis values of odors has been designed and verified. We developed a deodorizing filter that effectively deodorized with minimal use of deodorant, combined with a dust filter based on these figures, to develop a high-performance air conditioning cabin air filter.