Long-term exposure to high levels of manganese can result in effects on the central nervous system such as visual reaction time, hand-eye coordination and hand steadiness. Exposure to higher levels over a long period of time can result in a syndrome known as manganese. This leads to feelings of weakness and lethargy, tremors and psychological disturbances. Between 1990 and 2018, emissions have increased by 16%. This is largely due to an increase in industrial use of biomass as a fuel. In 2018, 71% of manganese emissions came from industrial combustion of biomass and wood.
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