The indoor air quality of subway is potentially affected by ventilation facility, quality of fresh air, depth of station, and airflow composition.
通风设施、新风质量、站台地层深度、气流组份对地铁车站室内空气质量均会产生一定影响。
Based on the analysis of the variation law of smoke flow in subway platform fire, a concept about critical ventilation speed from platform to concourse was presented.
在分析了地铁站台火灾时烟气流场变化规律的基础上，提出了临界通风速度的概念。
They stopped adding smell into the ventilation system of the subway train or of the car of the train months before.
这种在地铁通风系统、或者只是在某一节车厢的通风系统内添加臭味的行为几个月前才停止。
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