Where are the olfactory receptors located in the human nasal cavity?

In the human nasal cavity, the olfactory receptors are located within the olfactory epithelium, which lines the upper part of the nasal cavity.12

Specifically, this specialized region is situated beside and above the uppermost nasal concha (turbinate). This area is distinct from the lower respiratory portion of the nasal cavity, which is lined with a different type of mucous membrane. The olfactory receptors are embedded in this specialized membrane, where they detect airborne chemicals that have dissolved in the thin layer of fluid covering the surface.31