The intensified heatwave conditions in 2015 exposed millions of people to extreme heat stress, posing significant health risks, particularly for vulnerable populations such as the elderly and those with pre-existing conditions. The increased wet-bulb temperatures, which measure combined heat and humidity, raised the risk of heat-related illnesses and fatalities. Additionally, the affected land area experienced heightened environmental stress, potentially impacting agriculture and water resources. These findings emphasize the importance of addressing aerosol pollution to reduce future heatwave severity and associated risks.