Dollar bills with Euro notes

The dollar fell against most currencies on Tuesday, weighed by a drop in U.S. Treasury yields amid a cautious global sentiment with political worries in Europe and weaker stock and commodity markets after a long U.S. holiday weekend.

"There is a whiff of risk aversion about the markets," said Shaun Osborne, chief FX strategist at Scotiabank in Toronto, after Japan's Nikkei dropped, European stocks fell and U.S. equity indexes slid.