Mystery still remains over what the substance was that caused 16 Qantas office workers to fall ill after breathing in a noxious odour in a 16-storey building last week.
A Qantas spokesperson said the airline was continuing to work together with the property manager Bayleys and WorkSafe NZ to understand what caused the incident and to make sure it did not happen again.
Various tests carried out after the incident throughout the weekend did not pick up any further issues or abnormalities and will continue over the next two weeks. Air monitoring systems were also put in place.
Bayleys commercial property manager Hamish Mackereth said the cause is still being investigated.
"Further minor testing will continue for the next two weeks to exhaust all possible causes of the suspected contaminated leak."