（北京24日综合电）针对有网民披露中国高铁车厢内二氧化碳浓度一度超过2000ppm，并质疑这可能是乘客在车上容易犯困的原因，专家指出，这一数值并未超出旅客列车的安全标准，不会对健康造成影响。
综合澎湃新闻和《潇湘晨报》报道，一段实测高铁车厢空气质量的视频近期在网上流传。拍摄者余先生因出差频繁，常在高铁上办公，却经常感到困倦，于是出于职业习惯，在一次长途行程中用专业仪器测量了二等座车厢的二氧化碳浓度。结果显示，乘客入座前浓度约为880ppm，随着乘客陆续上车明显上升，列车运行一段时间后超过2000ppm。
在正常环境下，二氧化碳浓度一般为400ppm至500ppm，而浓度升高会影响认知功能；升至1000ppm时，决策能力可能下降，超过1400ppm时影响更为明显。
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