It is believed that electromagnetic radiation generated from various sources like mobile phones, transmission lines and many more could be a threat to Human Health. Researchers have carried out researches to prove such claims. This Study was carried out to show the magnitude of Magnetic Field generated by 330kV and 132kV Transmission Lines between 0-100meters from the Tower in GRA, Benin City. Also, the weekly study of the behavioral activities of people resident or trading (Traders/mechanics) along these lines for 3months was also undertaken. The Data obtained were juxtaposed with the international standard requirement to propose the possible effects of the Fields as listed.