Photocatalyst coating is a type of coating that uses a chemical process called photocatalysis to break down organic and inorganic substances when exposed to light. The coating contains a photocatalyst, typically titanium dioxide, which reacts with ultraviolet light to produce reactive oxygen species that can break down pollutants, odors, and microorganisms on surfaces. Photocatalyst coating can help improve indoor air quality, reduce the spread of harmful microorganisms to promote a cleaner and healthier environment.