A Canadian dollar coin, commonly known as the "Loonie," is pictured in this illustration picture taken in Toronto, January 23, 2015.
"The (U.S.) dollar is reasserting itself as the champion of the currency market and the Canadian dollar is just caught in that wave," said Adam Button, chief currency analyst at ForexLive.
S&P Global's measure of Canadian manufacturing activity edged higher last month to 49.6 from 48.8 in June.
Canada's employment report for July, due on Friday, could offer further clues on the strength of domestic activity.
The price of oil, one of Canada's major exports, edged lower on signs of profit-taking after a rally in July.
Persons:
Mark Blinch, Adam Button, Fergal Smith, Jonathan Oatis
Organizations:
REUTERS, greenback, PMI, Canadian, U.S, ., Thomson
Locations:
Toronto, TORONTO, U.S