We didn't know their names until now. One was a young car salesman, another a part-time seamstress, a third was a painter.

On Thursday, a coronial hearing into Melbourne's unprecedented "asthma cluster" disaster revealed the identities of all 10 victims, including four who had not been publicly named.

The coronial investigation is set to probe what was known about the thunderstorm asthma phenomenon before November 21, and by whom.

It will also investigate how prepared Ambulance Victoria and the Emergency Services Telecommunications Authority are to handle any repeat mass asthma events.