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Parts of America are enduring temperatures colder than Antarctica this week as a blast of Arctic air from the polar vortex has caused the mercury to plunge as low as -40C (-40F). US officials are urging residents from northern states to stay inside as the deep freeze sets in across the country, bringing with it life-threatening conditions that have forced rail workers in Chicago to start track fires to keep them warm enough to function, and led to warnings not to breathe too deeply when outside. Brian Hurley, a meteorologist with the National Weather Service's weather prediction centre in Maryland, said: “The heart of this cold ... is hitting us now.
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