Cellular phone technology has made radical changes in global telecommunication scenario with exponential growth in cell phones and base towers. The effect of non-ionizing electromagnetic radiations on human health is a subject of serious concern with the enormous installation of base stations. With a view to study the near field areas of base stations, we selected certain locations in southern districts of Kollam and Trivandrum in Kerala state, India. We assessed the power density of radio frequency waves from mobile towers using a handheld pocket digital LCD microwave leakage radiation detector. The area near the mobile towers were divided into concentric circles, each with increasing radii of 5m maximum. The survey was carried out in various towns having large population. The power density and Specific Absorption Rate (SAR) rates were determined from the field measurements. The present study was conducted only to near field and ground level radiations.