Hairs have various uses in environmental toxicology and they may have some impact on the hair history. There are different types of researches in environmental toxicology which is now related to environmental sciences. Various analyses of hair samples has many advantages in environmental toxicology as a preliminary screening method for the presence of various toxic substances which are deleterious to body health after exposures in air, soil, dust, sediment and water. It also has the other presence such as food and toxins in the environment. The various types of hair analysis includes the non-invasiveness, incurring low cost and the ability to measure a large number of biologically essential elements such as potentially interacting and toxic. Because hair is nothing but the keratinized, cylindrical and often has pigmented filaments which characteristically growing from the epidermis part of the human body of any mammal and the growth of such filaments, which is found that it is forming the coat like protection of an animal or covering the scalp of any human being.