Air filters are used to remove particulates and microorganisms from the air stream. However, under suitable conditions, retained microbes can propagate and re-enter the filtered air, exposing users to respiratory problems such as allergy and pneumonitis. To solve this problem, NANOTEC research team has employed nano-coating technology to impart antibacterial and antifungal properties to an air filter. Dr. Nuttaporn Pimpha, Team Leader of Environmental Nanotechnology Research Team, Nanohybrids and Coating Research Group, explained that nanoparticles coated on the filter inhibit bacterial and fungal growth. The nano-coating process is simple and cost-effective and can be easily applied by the industry. In addition, the coating material does not alter other functional properties of the air filter.