The Australian dollar remained under pressure during Wednesday's local session, after disappointing manufacturing data added to global worries about the state of China's economy.
The Aussie fell nearly three-quarters of a cent to the day's low of US70.19Â¢, after the release of the Caixin flash manufacturing purchasing managers index for   September showed that the key sector is still struggling. In late local trade, the dollar was buying US70.33Â¢. 
The PMI came in at 47, lower than the previous month's reading of 47.3 and more worryingly, below consensus forecasts of 47.5. A reading lower than 50 in the index indicates the sector is in contraction. "This number should be a wake-up call for the RBA and we're seeing the market react with the Aussie dollar feeling the pressure post release," OANDA Australia and Asia Pacific senior trader Stephen Innes said. "This is definitely a bearish signal, and we're seeing the foreign exchange markets react accordingly."
The dollar had already come under pressure on Tuesday night, dropping below US71Â¢ for the first time in a week after prices of major commodities retreated, also mainly because of the poor growth outlook for China.
National Australia Bank senior currency strategist Emma Lawson said the commodity pressures could continue.
"There was also pressure on commodities and thus commodity producers (Brazil's real is the worst-performing currency and commodity producer equities are under pressure) given the uncertainty about global growth and what is happening in China," Ms Lawson said. "That comes with no new information from China yet this week and which indeed has been relative stable. The [Australian dollar] has been a little softer overnight, but if this theme catches on, it could be expected to underperform."
Another factor pushing the Aussie lower was the rallying greenback as the latter hit a two-week high against the euro as concerns about monetary policy tightening by the US Federal Reserve further swirled through market sentiment.
BK Asset Management director of foreign exchange strategy Boris Schlossberg said global currency movements were likely to be calmer and lacking momentum on Wednesday.
"With no major US economic releases on the docket today, the price action in the currency market may remain directionless for the rest of the day," Mr Schlossberg said.
"Generally volatility appears to be much more muted this week as markets digest the FOMC data from last week and appear to have settled into comfortable ranges as they look for a new theme to trade."