The two main sources of pollutants in urban areas are transportation (predominantly automobiles) and fuel combustion in stationary sources, including residential, commercial, and industrial heating, cooling and coalburning power plants (Socha. 2007). Pollution by heavy metals occurs largely from industrial, domestic and agricultural wastes as well as  from combustion of fossil fuels by automobiles and industries (Odukoya et al, 2000). Onianwa, et al (1983) reported that; in addition, to natural sources, trace metals are emitted through great variety of technical and industrial processes, such as metal smelters and petrochemical plants. The trace metals may enter food chain from soil through mineralization by crops or environmental contamination as in application of agricultural input such in pesticides, fertilizers or use of polluted river for irrigation to water crops (Abdullahi et al., 2008; Miller, 1996; Onianwa et al., 2001; Audu and Lawal, 2005; Mohamad et al., 2006). 262  Lead (Pb) is one of the trace metals that accumulate in the body and has variety of harmful effects, including brain damage in high concentrations (Montgomery, 1992). Mild lead poisoning in the nervous system can cause depression, nervousness, apathy and other psychological disorders, as well as learning difficulties. The symptoms of lead poisoning are abdominal pain, nausea, numbness of the hand, feet and muscle cramp. Ideriah, (1996) reported that lead is a non-essential element for man and has toxic potential for all biological systems. The biological effects of lead include effects on haem biosynthesis, the nervous system, kidneys, reproduction, immune system and also cardiovascular, hepatic endocrinal and gastrointestinal effects (WHO, 1987).