adjective
odorous
OH-der-uhs/ˈəʊdərəs/
Having a noticeable smell, often unpleasant.
The odorous sock makes the man pinch his nose and hold it away.

Etymology
The pieces describe something characterized by a smell. Earlier use included fragrant things; the connection is to emitting a scent, whether pleasant or unpleasant.
In context
use proper designed Odor Control units to extract these odorous gases from its source and treat the odor before spread to the surrounding air
More examples
- The factory installs filters to trap odorous gases.
- Odorous herbs release their scent when you crush the leaves.
- Keep odorous foods in tightly sealed containers.
Forms
odorous
odor noun — A smell, especially an unpleasant one.
Similar words
- smelly
- More informal and usually suggests an unpleasant smell.
- malodorous
- Specifically describes an unpleasant smell, not merely a noticeable one.
- fragrant
- Specifically describes a pleasant smell, rather than any noticeable odor.