City officials say no evidence of elevated chemical levels after refinery fire

City officials say there's no evidence that the explosive refinery fire last week caused elevated levels of dangerous chemicals or had any public health impact.  At an update Tuesday, officials said investigations into the cause of the fire are underway, but they will take some time to complete.  Deputy Health Commissioner Caroline Johnson said Air Management Services has been doing "aggressive" monitoring of chemicals associated with fires and burning fuel. "They have been doing daily inspections in the community and along the fence line of PES (Philadelphia Energy Solutions), and all of those have been negative," she said, adding there's no evidence of any other public health effects. She said that may be due to the prevailing winds the night of the fire, in which "weather patterns actually blew the smoke away from the city." The fire burned for more than 24 hours after an explosion that officials believe started from a vat of butane and propane. The city has also seen no increase in cases of respiratory distress or any other fire-related complaints, according to Johnson. Fire Commissioner Adam Thiel, however, said his department still hasn't placed the incident under control.