The main categories of organic pollutants are (a) Polycyclic aromatic hydrocarbons (PAHs) arise from incomplete combustion or pyrolysis of organic substances such as wood, carbon or mineral oil. Such combustion processes include food preparation in households and food shops; etc. and (b) Polychlorinated Biphenyls further subdivided in to two category for its sources as Directly manufactured PCBs used as hydraulic liquids(hydraulic oils), emollients for synthetic materials, lubricants, impregnating agents for wood and paper, flame protective substances, carrier substances for insecticides and in transformers and condensers, and The other main source of PCBs in the environment are combustion processes, from waste incineration plants, fossil fuel burning and to other incomplete combustion processes. Peer review refers to the work done during the screening of submitted manuscripts and funding applications. This process encourages authors to meet the accepted standards of their discipline and reduces the dissemination of irrelevant findings, unwarranted claims, unacceptable interpretations, and personal views. Publications that have not undergone peer review are likely to be regarded with suspicion by academic scholars and professionals.