The greatest number of people affected by compounding effects of heat, wildfires and poor air quality will be in urban and peri-urban areas of Australia. By 2100 the proportion of all deaths attributable to heat in Melbourne, Sydney and Brisbane may rise from about 0.5% to 0.8% , or 3.2%  . Heatwave related excess deaths in Melbourne, Sydney and Brisbane are projected to increase to 300/year  or 600/year  during 2031-2080 relative to 142/year during 1971-2020, assuming no adaptation and high population growth . High temperatures amplify the risks due to local air pollution: without adaptation, ozone-related deaths in Sydney may increase by 50-60/year by 2070 .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report