Determination of health hazards for GSM BTS station by using fuzzy logic

There is currently a general consensus in the scientific and standards community that the most significant parameter, in terms of biologically relevant effects of human exposure to radiofrequency electromagnetic fields, is the specific energy absorption rate (SAR) in tissue, a quantity properly averaged in time and space and expressed in watts per kilogram (W/kg). A large number of biological effects have been reported in cell cultures and in animals, often in response to exposure to relatively low-level fields and the subject of on-going research. The Institute of Electrical and Electronics Engineers (IEEE) recognizes that there is public concern about the safety of exposure to the radio frequency (RF) and microwave (MW) fields from hand-held, portable, and mobile cellular telephones. International organizations have established guidelines for human exposure to radio frequency energy. While these guidelines differ in some respects, their limits in the frequency range used by wireless communications devices are broadly similar. The consensus of the scientific community, as reflected in these exposure guidelines, is that exposure to RF energy below recommended limits in these guidelines is safe. However there is a scientific discontinuity in view of health hazards. Fuzzification of the discontinuity problem makes the “soft” boundaries between hazardous region and non-hazardous region.