Birmingham New Street railway station in the UK has recently undergone a substantial redevelopment at a cost of more than £600 million. However, the unique underground tunnel geography of the platforms has remained virtually unchanged, which means that diesel exhaust gases are effectively trapped causing a daily build-up of air pollution in the station. A new ventilation system has been installed consisting of 98 bi-directional fans that are meant to disperse any air pollution out of the station. Unfortunately, the fans were triggered by carbon dioxide levels that do not significantly correlate with more serious air pollutants such as nitrogen oxides. In August 2018, new workplace exposure limits (WELs) were introduced for nitrogen monoxide (NO) and nitrogen dioxide (NO₂). However, during a recent measurement campaign, one of the new WELs would have been exceeded on most days. Network Rail has undertaken to introduce a number of interventions, including the installation of new nitrogen monoxide/dioxide sensors to drive the ventilation system together with new sonic wind sensors, encouraging train operating companies to switch off idling diesel engines and encouraging more electric/hybrid trains.

中文翻译：

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减少伯明翰新街站有害空气污染的干预措施

英国伯明翰新街火车站最近进行了大规模重建，耗资超过 6 亿英镑。然而，站台独特的地下隧道地形几乎没有改变，这意味着柴油废气被有效地截留，导致站内的空气污染每天都在累积。安装了一个新的通风系统，由 98 个双向风扇组成，旨在将任何空气污染驱散到车站外。不幸的是，风扇是由二氧化碳水平触发的，而二氧化碳水平与氮氧化物等更严重的空气污染物没有显着相关性。2018 年 8 月，针对一氧化氮 (NO) 和二氧化氮 (NO ₂). 然而，在最近的一次测量活动中，其中一个新的 WEL 在大多数日子里都会被超过。Network Rail 已承诺采取多项干预措施，包括安装新的一氧化氮/二氧化氮传感器以驱动通风系统以及新的音速风传感器，鼓励列车运营公司关闭空转的柴油发动机，并鼓励更多的电动/混合动力列车.