The main purpose of this inventory is to produce based line information on mercury release sources, exposure routes and possible quantities released into the environment. Inventories for such releases form an important tool in the decision process of mitigating environmental impacts from the pollutants. When Yemen has decided that mercury pollution is a potential priority problem that needs to be evaluated further, it will typically need to estimate both the relative and the absolute contributions to mercury releases from the different sources present in the country. This information can be used to determine which release source types are significant and which sources should be addressed through release reduction initiatives.