environmental and occupational exposure to nickel in iran:a systematic review

introduction:. nickel (ni) is one of the toxic heavy metals that exposure to it has been connected with chronic respiratory complications such as asthma, chronic bronchitis, lung cancer and heart diseases .. in this research,  original studies that investigated occupational or environmental exposures to nickel and  measured nickel levels in human tissues was reviewed. materials and methods: in this study articles reviewed systematically.  national databases such as sid and magiran  as well as some international databases  including pubmed,  web of knowledge, scince direct and google scholar were searched; to extract studies conducted in iran until august 19, 2016.  results: based on the results, industrial  professions such as welding and plating who dealt directly with nickel were at a higher risk of contamination. in overall,   residents in large polluted cities or taking dental treatments, had more nickel concentrations in their body than others. conclusion: considering the high nickel contamination in industrial workers, it seems to be necessary to do regular surveillance in this group through periodic regular check-ups and avoiding unnecessary exposure to nickel as much as possible.