Group 1 - The article highlights the upcoming peak of extreme high temperatures in China, affecting a large area from southern North China to central and northern South China, with many regions experiencing rare high temperatures for this time of year [1] - Experts recommend avoiding outdoor activities between 10 AM and 4 PM when UV radiation is strongest, and suggest carrying sun protection gear such as umbrellas, sunglasses, and sunscreen [1] Group 2 - According to Dr. Yang Shuxia, the director of the Dermatology Department at Peking University First Hospital, darker clothing provides better sun protection due to its higher dye concentration, which absorbs more UV rays [2] - The article emphasizes that even on cloudy days, about 70% of UV rays can penetrate clouds, making it essential to apply sunscreen regardless of weather conditions [3][4] Group 3 - For prolonged outdoor activities, experts recommend a combination of physical and chemical sun protection, including UPF 50+ clothing, wide-brimmed hats, and SPF 30+ sunscreen, applied 20 minutes before going outside and reapplied every two hours [5][6] - In case of sunburn, immediate cooling with lukewarm water and the application of aloe vera or vitamin E products are advised, with a recommendation to seek medical attention for severe cases [7]