Nasal hair are small hair-like cells in the nose. Most of them can be found near the nostrils. The purpose of these hairs is to act as a filter, keeping dust and dirt out of the nasal passages. They also draw liquid mucus up from the epithelium by capillary action. In that way, they help to maintain humidity in the air passages and stop them from drying out. The hairs trap moisture as air is breathed out. The evaporation of trapped moisture on the hairs increases the humidity of air as it is breathed in. Note that nasal hair is different from the cilia found in the nose, which are part of the olfactory system.