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Utilizing ultraviolet (UV) light to treat our buildings’ conditioned air is becoming more common, particularly during the COVID-19 pandemic. But is that always a good thing? Is UV light effective at improving indoor air quality or is it yet another overhyped product sold to facility owners that want an easy fix? We will discuss the science behind UV germicidal irradiation, how and why it works, how to use it effectively, and the safety and health risks that come along with it.