Mercury can be sourced from both Environmental( and human-driven process( Mining, Fossil fuel).
A specific form of Mercury called Methylmercury is known to be toxic to humans causing a neurological diseases called the Minamata disease, the disease has proven to be a cause of insanity, paralysis and numbness among others.
During the 18th and 19th century workers in the hat-making trade were exposed to mercury nitrate, Chronic mercury poisoning led to symptoms such as tremors, irritability, hallucinations, and other neurological issues, therefore the term "Mad Hatter" is coined.
Prolonged exposure to mercury vapors caused severe health effects among hatters, including: Memory loss, Speech problems, and depression.
To eliminate the health impacts of Methylmercury, policies and regulations to limit mercury emissions were implemented across the globe. And, according to research published in ACS ES&T Air, those efforts seems to be working.
The researchers stated that after closely tracking mercury pollution over four decades at the top of the world, mercury levels have decreased by 70% in the last two decades. This is achieved as a result of reduction in human-driven mercury emissions, presently the soil emit 60% mercury while human-related sources only emits 28%.
Wondering how they arrived at that conclusion?
They did so by sampling older leaves from the center of two plants on mountain Everest, they got information on atmospheric mercury levels as far back as 1982. They found that between 2000 and 2020, the total atmospheric concentration of elemental mercury decreased by 70%.
Interested in further reading?. You can have access to the complete journal: Ruoyu Sun, Rui Zhang, Yuchen Yang, Yi Liu, Wang Zheng, Qianggong Zhang, Huiming Lin, Yindong Tong, Yanxu Zhang, James Schauer, Xuejun Wang, Jiubin Chen. Four Decades of Atmospheric Mercury Records at Mt. Everest Reveals Significant Reduction in Anthropogenic Mercury Emissions Over the Past Decade. ACS ES&T Air, 2025; DOI: 10.1021/acsestair.4c00296
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