The deaths of two people who died during Melbourne's "thunderstorm asthma" event will be investigated by health authorities.
Paramedics dealt with an unprecedented 1900 emergency calls in five hours on Monday evening and hundreds more streamed into hospitals.
Hope Carnevali's family say the 20-year-old died while waiting for an ambulance, and now say they wish they had taken her to hospital themselves.
Victorian Health Minister Jill Hennessy says the storm put unprecedented demand on the health system.
She's waiting for details of the two deaths.
Ambulance Victoria says it will complete a clinical review within a few days as to whether the two deaths were related to ambulance delays and the asthma event.
Thunderstorm asthma is caused when dust and pollen is blown in or ahead of a thunderstorm.
The moisture then causes the pollen grains to burst into hundreds of fragments tiny enough to penetrate deep into the airways.
