The U.S. is moving to revive mercury limits for coal-fired power plants. A scientist explains mercury’s health risks and the role power plants play.
People fishing along the banks of the White River as it winds through Indianapolis sometimes pass by ominous signs warning about eating the fish they catch. $ { var messages=[ { 'title': 'Subscribe to stay connected to Tucson.', 'msg': 'A subscription helps you access more of the local stories that keep you connected to the community.
Mercury is a bioaccumulative toxin, meaning that it increasingly concentrates in the flesh of organisms as it makes its way up the food chain. How coal plant mercury rains downIn our study, we wanted to answer a simple question: Did the local coal-burning power plants, known to be major emitters of toxic mercury, have an impact on the local environment?
Traveling by air and water, miles from the sourceMercury emitted from the smokestacks of coal-fired power plants can fall from the atmosphere with rain, mist or chemical reactions. Several studies have shown elevated levels of mercury in soils and plants near power plants, with much of the mercury falling within about 9 miles of the smokestack.
We also found high levels well downstream of the city. Thus a fisherman out in the countryside, far away from the city, was still at significant risk of catching, and eating, high-mercury fish. The MATS rule helped tilt the national energy playing field away from coal, until the Trump Administration attempted to weaken the rule in 2020 to try to bolster the declining U.S. coal industry. The administration rescinded a “supplemental finding” that determined it is “appropriate and necessary” to regulate mercury from power plants.
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