 This research paper examined the effects of heat waves on mortality rates across Europe between 1990 and 2004. It found that the impact of heat waves varied greatly depending on the city, with some cities experiencing higher mortality rates than others. The highest mortality rate was seen in cities located in the Mediterranean region, while the lowest mortality rate was seen in cities located in the northwestern part of Europe. Additionally, the study found that heat waves had a greater impact on older adults, women, and individuals who suffer from chronic respiratory illnesses.