You would find pseudostratified columnar epithelium lining the

The wall of the trachea and also the upper respiratory tract.

Explanation:

The pseudostratified columnar epithelium is grouped into two

- Ciliated pseudostratified columnar epithelium

- Non-ciliated pseudostratified columnar epithelium

The ciliated pseudostratified columnar epithelium, a form of respiratory epithelium is found lining the wall of the trachea and also including the upper respiratory tract. while the non-ciliated pseudostratified columnar epithelium is found lining the prostate and membranous part of vas deferens in the males.