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Purpose Biological monitoring of polycyclic aromatic hydrocarbons (PAHs) has expanded rapidly since urinary 1-hydroxypyrene (1-OHP) was suggested as a biological index for pyrene. Taking into account that pyrene is often present in PAHs mixtures, 1-OHP has also been considered an indirect indicator of exposure to these mixtures. Sources of PAHs in developing countries are numerous; however, exposure...