A refinery in New Castle County, Delaware, is facing criticism from state lawmakers after announcing repairs that will push sulfur dioxide emissions beyond permitted levels. The Delaware City Refining Company is repairing a coker carbon monoxide boiler, a process that will lead to higher emissions for approximately four weeks. State officials from the Department of Natural Resources and Environmental Control are monitoring ground-level air quality to ensure public safety. This incident follows a history of violations, including a previous penalty of 300,000 dollars for unpermitted emissions and a butane leak in 2025.
