Joint Operation Command in Iraq spokesman Brig Gen Yahya Rasool told The Associated Press that six soldiers suffered breathing problems from the attack on Sunday and were treated in a nearby field clinic.
Prime Minister Malcolm Turnbull said no Australian military advisers were affected by the gas.
"My advice right at the moment is that no Australian troops were affected by the chemical attack, but Australian forces did provide assistance following the attack," Turnbull told Australian Broadcasting Corp.
ABC reported that the Iraqi military unit that was attacked had both Australian and US military advisers.
An investigation was launched to determine what type of gas was used.
Australia has 300 troops and New Zealand 110 troops involved in military training at the Taji Military Complex northwest of Baghdad.
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