The Allegheny County Health Department has found no indication of a long-term health emergency after U.S. Steel’s Clairton Coke Works experienced a breakdown of pollution control equipment this week. A breakdown occurs when equipment stops working properly and releases more pollution than usual, county health officials said in a statement Thursday. According to county officials, Control Room 2 at Clairton Coke Works went offline Tuesday at about 8:05 p.m. and lasted until about 8:30 p.m. the next day. An explosion at Clairton Coke Works in August left two dead and others hurt. U.S. Steel officials said there had been no indications of safety concerns prior to the fatal blast.