The fire, which shines with its brilliance on Holika Dahan decomposes the raja-tama particles in the atmosphere. The day prior, however, is known as Holika Dahan or Choti Holi. A huge bonfire is made and students circumbulated around it . Everyone is aware about Holika and Prahlad's story , but here comes the scientific reason : "Holi actually marks the end of Spring and beginning of Summer." The crops, trees, in general the atmosphere heats up throwing out various types of bacterias and viruses. These germs get killed due to the bonfires across cities. People use cow dung and ghee in bonfire, the smoke of which helps in eliminating these bacteria and pollutants from the environment. Holika Dahan, on the other hand, is performed to burn all that is dry and dirty to pave the way for new life in the spring. Following the tradition when people perform Parikrama (go around the bonfire/pyre), the heat coming from the bonfire kills the bacteria in the body and cleanses it