The lawsuit is challenging a plan to allow spikes of sulfur dioxide at two power plants. Even at low levels, SO2 can affect asthmatics in as little as two minutes.
Murray’s companies fought against safety rules meant to prevent the fatal disease. He ran the largest privately-owned underground coal mining company in the US.
The Trump administration's rollback exempts some coal-fired power plants from Obama-era rules for wastewater containing toxins like mercury, arsenic and selenium.
An NPR investigation into the regulatory failures — and the human costs, including to Pennsylvania miners — of a disease that has been described as "suffocating while alive."
