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Automotive cabin air filters have become increasingly popular as automotive manufacturers recognize the need to provide vehicle occupants with a more comfortable driving experience. Cabin air filters which reduce particulates (e.g. dust, pollen) have been standard on many European models since the late 1980's and have recently become available on several vehicles produced by Ford Motor Company in North America. Market research (focus panels and customer surveys) has shown that consumers expect cabin air filters to reduce both particulates and odors/gases and as a result, future vehicles will offer systems which address both. Test methods and standardized test codes for evaluating these types of filters are currently being drafted. Current methods for testing such gas/odor filters call for part-per-million challenge levels for reasons of analytical simplicity and test speed.