Yes, UV light air purifiers are effective at killing viruses and bacteria. They use ultraviolet (UV-C) light to destroy the DNA or RNA of microorganisms, rendering them inactive. However, their effectiveness depends on factors such as the exposure time and the intensity of the UV light. While they are good at neutralizing airborne pathogens, they may not be as effective against allergens or dust particles. Regular maintenance and proper placement are crucial for optimal performance.