White sage has microbial, and anti-bacterial qualities that keep bacteria, viruses, and infectious fungi at bay.  when burned, it releases negative ions and help neutralize positive ions, such as allergens of pet dander, pollution, dust and mold . 
It can cleanse the aura and release negative energy due to a psychoactive component called thujone. 
Sage smudging is an ancient practice used for healing, in ceremony, and energy clearing work. It’s also a common tool that many spiritual practitioners and seekers use today to energetically clear and protect spaces. 4 inch bundle with string.