Modifies a noun

• substance: The grease filter absorbs the grease while the activated carbon filter absorbs any odorous substances.

• gas: This shutdown possibly caused the escape of odorous landfill gas from the site.

• liquid: It is a thick odorous liquid containing about 4 % solids.

• compound: Even tho air handling systems are intended to improve indoor air quality and climate, they have often become major sources of odorous compounds.

• chemical: Smell: Your carpet acts as a filter, removing odorous chemicals from the air.

• oil: Volatile oil an odorous plant oil that evaporates readily; also called essential oil.