史上最热夏天，到底有多「致命」？

Core Viewpoint - The article emphasizes the increasing severity and danger of extreme heat waves affecting various regions in China, particularly highlighting the impact on public health and safety [3][12][106]. Group 1: Extreme Heat Impact - The article discusses how extreme heat has become a common experience across northern cities, with temperatures reaching alarming levels, such as 43°C in multiple locations in Shandong [55][50]. - It highlights the sudden onset of high temperatures, catching many residents unprepared, especially in areas with low air conditioning penetration [11][90]. - The article notes that extreme heat is not just uncomfortable but can lead to serious health issues, including heat stroke and even fatalities [80][64]. Group 2: Regional Variations - The article points out that while northern regions are experiencing unprecedented heat, southern regions are also facing their own challenges with high humidity and heat [36][48]. - It mentions specific cities like Beijing and Shandong, where the combination of high temperatures and humidity has created dangerous conditions for residents [17][52]. - The article also references the unusual heat experienced in traditionally cooler areas like Northeast China, where temperatures have soared unexpectedly [28][31]. Group 3: Health Risks and Responses - The article details the symptoms and dangers of heat-related illnesses, particularly heat stroke, which can have a high mortality rate if not treated promptly [80][94]. - It emphasizes the importance of preventive measures, such as staying hydrated, avoiding outdoor activities during peak heat hours, and utilizing air conditioning where available [99][88]. - The article warns that the frequency of extreme heat events is likely to increase in the future, necessitating greater awareness and preparedness among the public [106][108].