我国旅客列车室内二氧化碳浓度标准限值为2500ppm ,对旅客健康无影响

Group 1 - The reported CO2 concentration in high-speed train carriages exceeds the standard limit of 1000ppm, but this information is based on a standard not applicable to passenger trains [1] - The CO2 concentration control standards for passenger trains in China are defined by TB/T 3493-2017, with a normal operational limit of 2500ppm, while European standards set the limit at 5000ppm [1] - The standards for passenger trains are based on the unique characteristics of mobile transport equipment, considering factors like internal pressure fluctuations and overall comfort indicators [1] Group 2 - The train sets are fully airtight, with air exchange entirely managed by the air conditioning ventilation system, providing a fresh air volume of over 15m³/h per person and achieving 6 to 12 air changes per hour [2] - During normal operation outside tunnels, CO2 concentration typically does not exceed 1500ppm; however, in tunnels, pressure protection measures may temporarily increase CO2 levels without affecting passenger health [2] - The pressure protection system is designed to prevent external air exchange during tunnel passages to mitigate ear discomfort caused by pressure fluctuations [2]