Look no further. Ciliated pseudostratified columnar tissue is right under your nose — or more specifically, as near as your nasal cavity. Serving as a protective liner for parts of the respiratory system, this kind of epithelial tissue has something special going for it: little filaments (cilia) that ward off harmful intruders by providing a brushlike barrier.
The pseudostratified part of the tissue type refers to the false layering effect of the cellular structure. What seems like multiple layers is really just one, all because of the way the cells are arranged with their nuclei out of alignment.
Being columnar allows these sorts of cells to be flexible, as they change shape to accommodate the ins and outs of human breathing. Add mucus-generating cellular bodies to the anatomical picture, and you get a powerful crew of housecleaners ready to protect your main residence. Germs and pollutants usually get hung up in the upper respiratory tract before they can make their way to your main air handlers, the lungs.