A. Finkl & Sons, a steelmaker whose roots in Chicago date to the late 1800s, has agreed to add pollution controls and pay the state of Illinois $125,000 to settle accusations that the company broke environmental laws by releasing excessive amounts of a harmful gas.

In settling, Finkl, now owned by Swiss Steel, didn’t admit any wrongdoing.

It was accused of not controlling the amount of nitrogen oxide emissions from its Far Southeast Side plant at 1355 E. 93rd St. between late 2021 and early 2022. Attorney General Kwame Raoul’s office said Finkl failed to operate and maintain equipment, causing an increase in nitrogen oxides.

The operation has until June 2027 to install a new emissions-monitoring system, according to Raoul.

After more than 130 years in Lincoln Park, operating along the

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