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 2021, emissions have increased by 4.5%. In 2021, 58% of manganese emissions reached a low point in the mid-2000s when emissions were approximately half of what they were in 1990. In 2021, 58% of manganese emissions came from industrial combustion of biomass and wood.