The dollar fell to its lowest level of the year today as investors grew nervous that the US could lose its triple-A credit rating, Reuters reports. The greenback declined to $1.39 against the euro and $1.58 against the pound, echoing similar drops across the world. Yesterday, Moody's said it was not changing America's AAA rating, but one foreign exchange strategist said, "It's hard to imagine a sharp reversal of the dollar's trend." (More US dollar stories.)