The Australian dollar has continued its sharply downside trend against the US dollar after the U.S. central bank will extend the average maturities of the Treasuries in its portfolio by purchasing $400 billion of long-term debt, while selling an equal amount of shorter-term securities.

Moreover, Australia's dollar slid to a six- month low versus its U.S. counterpart after a survey indicated that manufacturing in China, the nation's biggest trading partner, may weaken.

On the other hand, New Zealand's currency dropped to the lowest level in more than four months against the greenback after a government report showed second-quarter growth trailed economists' estimates.