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This research aims to know the levels of Pb (Lead) on thalus lichens found on the three forest shade trees road in the area of Terminal Pinang Medan, North Sumatera. Type of this research is a descriptive exploratory survey method. Measurement of the levels of lead (Pb) using Furnace (destruction of dried) and Atomic Absorbance Spectrophotometer (AAS) in Medical Field Laboratory Hall. From the results of research conducted in the Terminal Area of Pinang Baris Medan, it is known that there are 12 different types of lichens. Results of the study known types of lichens that have levels of lead (Pb) is a type of most lichens  Parmelia grabratula  49,01 mg/kg from Acacia trees  (Acacia auriculiformis)  I, and the lowest levels of lead (Pb) is a Palm tree from  Buellia canescens  10,19 mg/kg III  (Hyophorbe  sp .).

Levels Pb (Lead) Content in The Thallus Lichens at Three Shade Tress in The Terminal Pinang Baris Medan, North Sumatera