New Delhi, March 4 -- The dollar fell to a three-month low on Tuesday as concerns about slowing growth and the impact from tariffs on the U.S. economy outweighed any potential boost from the ramping up of levies on Canada, Mexico and China.

President Donald Trump's new 25% tariffs on goods from Mexico and Canada took effect, along with a doubling of duties on Chinese goods to 20%, at 12:01 a.m. EST (0501 GMT).

In response, China said it will impose additional tariffs of 10-15% on certain U.S. imports from March 10. Canada has said that retaliatory tariffs on the United States would take effect on Tuesday and Mexico is expected to follow suit.

Worries of a trade war and the hit to other countries' economies might be expected to boost th...