The extreme heat poses a significant risk of heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. Outdoor workers and individuals engaging in strenuous activities are also at risk. The heat advisory highlights the potential for temperatures to reach dangerous levels, especially on Sunday when highs could hit 105°F (40.5°C). Additionally, hazy conditions caused by smoke from western wildfires may impact air quality, posing further health risks for individuals with respiratory issues.