On May 30, 2026, Beijing recorded its first high-temperature day of the year, reaching 35.2 degrees Celsius, while Shijiazhuang City, northern China's Hebei Province, hit 35 degrees Celsius at midday. To ensure passenger comfort in the scorching heat, Beijing Subway launched its dual-temperature car system, maintaining a 2-degree Celsius difference between "cold" and "cool" cars. This flexible cooling measure directly guaranteed a more comfortable summer travel experience for local commuters and