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Why is mercury a concern in biomass combustion?

Mercury has a negative effect on human health which can cause harm to the brain, heart, kidneys, lungs, and immune system when exposed to high levels.

All biomass fuels have the potential for mercury values above the EPA’s proposed major source MACT limits indicating emissions monitoring or installation of a control technology may be required if new EPA regulations are enacted. Mercury (Hg) emissions from biomass burning (BB) are an important source of atmospheric Hg and a major factor driving the interannual variation of Hg concentrations in the troposphere.