WASHINGTON (AP) — Federal officials are close to a settlement with Exxon Mobil Corp. over air pollution charges against the oil giant.

That's according to a person familiar with the matter.

A settlement could be announced early this week, the person says.

The person spoke on condition of anonymity because the settlement has not been announced.

Details of the settlement, including whether the company will pay a fine, were not clear.

Exxon did not immediately respond to a request for comment.

The company based in Irving, Texas, has been sued by the government and environmental groups over fires at its refineries in recent years. It was not clear, however, if the settlement is related to refinery fires.