4.3 Relative humidity during this festival as seen from Fig.10.Fig.10(a)shows the diurnal change of the relative humidity one day prior to the day of festival (November 12,2012)and Fig.10(b) shows the relative humidity on the festival day (November 13,2012).Fig.10(c)-(I)is showing the relative humidity for the following three days aiter the festival (November)14-17,2012).The relative humidity throughout The day remained much lower during the festival day and following days compared to the normal day.particularly at 2Km.height , as shown in Fig.11.The change in the diurnal pattern of relative humidity as well as the change in the vertically features is due to increased temperature Caused by accumulated atmospheric pollutions at the boundary layer. Similar results were also. Obtained for the respective Deepawali awali periods for the year 2013