PITTSBURGH (AP) — An environmental activist group sued ArcelorMittal USA on Thursday for allegedly violating the Clean Air Act by showering nearby residents with soot and other pollutants from a western Pennsylvania coke plant more than 200 times since it reopened in April 2014.

PennEnvironment sent a 60-day notice letter to the Chicago-based steelmaker in August. The advance notice is required under federal law, which gives citizens the right to sue if regulatory agencies have not.

The Pennsylvania Department of Environmental Protection continues to work with the federal Environmental Protection Agency “with regard to operations at the plant and is evaluating appropriate enforcement actions,” DEP spokesman John Poister said Thursday.

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