The massive tyre fire at Broadmeadows is under control but will continue to burn for days, firefighters say.
The black smoke plume over Melbourne's northern suburbs created by the blaze on Monday began to dissipate on Tuesday, as firefighters set about dismantling the pile of tyres using excavators and bulldozers to get to the core of the fire.
Broadmeadows tyre fire covers suburbs in thick smoke
MFB's warning to residents as it battles to contain a large tyre fire at an industrial site in Melbourne's north.
Initial testing by the Environment Protection Authority near the fire has shown a spike in particle matter in the air, which can affect breathing and cause respiratory problems.
However, the MFB advice to residents was downgraded on Tuesday morning to say there was no longer any threat to the community, although people have been advised to avoid the area.
Health Department spokesman Bram Alexander said warnings issued for residents to stay indoors with their windows and doors closed were warranted on Monday.
"What it is indicating to us is that the shelter advice issued by the MFB was appropriate," Mr Alexander said.
The overall impact of the fire on air quality would not be known until later on Tuesday, Mr Alexander said, when 24 hours of monitoring could be compared.
Ambulance Victoria said it had no reports of respiratory problems in the Broadmeadows area.
The Metropolitan Fire Brigade expects it will take daysto fully extinguish the massive fire.
Up to 15 trucks and about 50 firefighters were at the fire in Maygar Boulevard on Monday night and Tuesday morning.
MFB incident controller Commander Peter Thomas told ABC radio cooler temperatures and lighter winds would help firefighters.
"It has been a pretty difficult fire," Commander Thomas said.
"Tyre fires always are pretty difficult, in terms of the intensity of the fire. They are usually a big pile and they usually take some time to get under control."
Firefighters were using water rather than foam, where possible, to battle the blaze, Commander Thomas said.
"The main issue is trying to knock down the heat and flames and water is the best way to do that," he said.
"But with tyres, once they burn, they release a lot of chemicals which sometimes requires foam, but we try to limit the foam because environmentally it is not the best thing for the environment."
Melbourne Water was capturing the run-off to prevent it getting into waterways, Commander Thomas said.
He said firefighters had been able to contain the blaze enough to begin using bulldozers and excavators to dismantle the tyre pile.
"That's the only way we are really going to extinguish it – to get to the bottom of the deep-seated fire," he said.
"[These are] big piles of rubbish, basically made of rubber, and you have got to get down to the bottom to extinguish all the hotspots within these big piles of rubber."
Fire investigators were expected to arrive at the scene on Tuesday to identify the cause of the fire.
Maygar Boulevard and Park Street remain partially closed and people have been advised to avoid the immediate area.
A residents meeting will be held on Tuesday at 2pm at the Hume Global Learning Centre on Pascoe Vale Road, Broadmeadows, where health and fire experts will be available to answer questions.