In New Jersey, Burlington County spokesman Jason Tosches said a Code Blue emergency has been in place since Dec. 25 and will remain through Wednesday evening, when the county will reassess whether to extend it. He said the county has five shelters, including one for families.Those who use the shelters do so for a variety of reasons, including homeless people who had been living outdoors, or elderly and poor residents who have no heat. The number of people placed in shelters was not available Tuesday, but all of the shelters have reached capacity or had been close to capacity, he said.