Indoor air pollution can have a negative economic impact due to harmful effects on occupant health, lower productivity of the workforce, or reduce industrial productivity. Thus, there is an active research on various indoor air purification technologies to tackle those challenges. Photocatalytic oxidation (PCO) using an emerging advanced oxidation process can be utilized in air cleaning devices for decomposition of air contaminants at low concentrations typically found in indoor environments. This paper presents an overview of various specific applications of photocatalytic air cleaning technology reported in the published literature. The findings are organized according to commercial, industrial, and residential buildings. The main function requirements for PCO air cleaning technology are decomposition of gaseous pollutants, disinfection of airborne microbial contaminants, and deodorization. The objectives for applying PCO in buildings include human health protection, energy and cost savings, olfactory comfort and process efficiency.
