US environmental regulators tighten pollution limits for taconite plants

The US environmental regulators are proposing new pollution limits for five taconite processing plants in Michigan and Minnesota. These plants will have to meet stricter caps on nitrogen oxide and sulfur dioxide emissions.

Taconite processing is a major source of air pollution in the Great Lakes region. For years, these plants operated under less stringent rules. This change means they must now invest in better pollution control technology or reduce operations to meet the new standards.