Although an air purifier and an air sanitizer effectively reduce pollutants in indoor air, the sanitizer is better at killing mold, bacteria, and viruses. On the other hand, the air purifier is more successful at reducing pollen and dust in the air. Both air cleaning methods lessen symptoms of asthma, allergies, and respiratory conditions and improve sleep. However, the better choice for you depends on your environment. For example, if you live in a dusty area, an air purifier will help increase good air quality by preventing dust buildup. Conversely, a UV air sanitizer unit is more appropriate when the risk is illness is a priority.