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The development of technologies for the reduction of mercury emissions from coal derived flue gas has taken substantial steps forward over the last ten years.Beginning with state or provincial regulations requiring high mercury removal efficiencies, and now a nationwide requirement in North America under review, much work has been completed.With the Legally-Binding Instrument for the Global Control of Mercury Pollution now signed, the need for a broader understanding of available solutions will increase worldwide.A broad spectrum of success has been demonstrated across numerous technologies; however, activated carbon over the long term has proven to be the most successful in achieving the highest removal rates across the broadest number of applications and fuels at a reasonable cost.As stricter regulations continue to be promulgated, emission rates on the order of 1 ug/dscm are becoming more common.