  Radon monitoring has recently gained extensive attention among seismologists.
It is now widely reported as a precursssory signal prior to occurrence of a
seismic event. The enhanced estimation of radon in soil gas is basically
attributed to the strain changes which arise within the earth surface. In this
chapter, the role of radon as a precurssor is eleborated, acompanied by the
anomalies which come across during observation. Additionally, the recent
studies done in Himalayan Belt is also reviewd along with future perspectives
in radon estimation.
