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To investigate the potential relevance between health problems and working environment conditions in chemical labs, liver enzymes were examined in both sera and saliva of student volunteers, during the last 15 days of September at which they probably exposed to various chemicals over three months in the Iraqi Chemistry Department. The results showed that there was no significant difference in serum activity for both AST and ALP, however, a significant increase in serum ALT level of Z =-2.355 (p < 0.019), before

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:The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) were determined in aerosol samples, which collected for the period (April 2012 to February 2013) at three sites in Baghdad city (AL-Daura refinery, ALDaura power plant and thermal power plant South of Baghdad). These aerosol samples undergone soxhlet extraction.After the extraction, 138 samples were analyzed by GC-MS to determine sixteen PAH compounds. The average concentrations of individual PAHs were measured in ambient air at the various season. The results indicate the spread of most of the sixteen PAHs at three sites in Baghdad city. Effect of sampling locations, seasons and meteorological conditions on the concentrations of PAHs were studied by SPSS. The positive correlation between the temperature and the total PAH concentration was varied in seasons, which indicated the existence of extrusive relationship between temperature and the total polycyclic aromatic hydrocarbon (TPAH) in the chosen sites.