The Canadian Dollar slipped on Tuesday falling to the weakest level in a four-month period after the global powers and Iran reached a deal over Iranian nuclear program pushing the oil prices down, Canada's largest export commodity. The so-called Loonie slid 0.3% to C$1.0543 per U.S. Dollar as of 5 p.m. Toronto time following a drop to C$1.0583, the least since July 8.