The dollar held firm against a basket of currencies on Tuesday as traders await the Federal Reserve's decision on whether to raise interest rates by year-end amid evidence the U.S. economy has slowed in recent weeks.
The Norwegian crown, Canadian dollar and other currencies that are sensitive to energy prices fell against the greenback as Brent crude futures in London fell to their lowest since mid-September on anxiety about oversupply.
The dollar has enjoyed a modest rebound since late last week, when China cut interest rates for the sixth time in less a year and the European Central Bank hinted it may expand its bond purchase program.
The greenback's relative strength has hurt U.S. exports and manufacturing activity. The government said on Tuesday its gauge of business investment plans fell for a second straight month in September.