New Zealanders with health issues are being advised to check with their health practitioners before travelling to Sydney.
Sydney is currently blanketed in a cloud of dense smoke caused by the NSW bushfires.
Australia's Department of Environment has issued a warning to stay indoors as the smoke is hazardous towards individuals with health issues.
"Everyone, especially people with heart or lung disease to avoid outdoor exertion and stay inside as much as possible," they said in a statement.
Conditions are expected to worsen as the fire continues to ravage NSW, destroying land and devastating households.
In New South Wales 303 homes have been lost in the past week while so far, six people have lost their lives in the blazes.
Kiwi firefighters have joined the fight to combat the fire.
Brent Thomas from House of Travel says people with health issues should check with their doctor before flying to off New South Wales.
"Obviously when we've got significant bushfires like we do at the moment, then people who have health issues, should be looking at having a conversation with their doctor before heading out to make sure they will not be impacted too severely," said Lewis.
Lewis told Newshub that ultimately it's the customers choice.
"It comes down to individual choices and their professional advisors, whether it is safe or not to fly."