WASHINGTON (AP) — The federal government announced a $241.5 million settlement with Marathon Oil on Thursday for alleged air quality violations at the company’s oil and gas operations in the Forth Berthold Indian Reservation in North Dakota.

The Environmental Protection Agency and Department of Justice said the settlement requires Marathon to reduce climate- and health-harming emissions from those facilities and will result in over 2.3 millions tons worth of pollution reduction.

“This historic settlement — the largest ever civil penalty for violations of the Clean Air Act at stationary sources — will ensure cleaner air for the Fort Berthold Indian Reservation and other communities in North Dakota, while holding Marathon accountable for its illegal pollution,” said Attorney General Merrick B. Garland.

Marathon officials did not immediately respond to a request for comment.