The contribution of ambient sources to particulate pollution in spaces and trains of the Prague underground transport system

Abstract During a fixed-route including (i) surface walk on streets, (ii) underground spaces (corridors, vestibules and platforms) and (iii) underground trains of the Prague Metro Rail System (PMRS) a fast response portable photometer was used to measure concentrations of PM10 (particulate matter ( p 0.001 ) between ambient and underground PM10 levels recorded by the photometer, the ambient concentrations were tightly associated with those from the underground spaces ( r 2 = 0.820 ) as well as from the Metro trains ( r 2 = 0.774 ) . The correlation between concentrations from both underground microenvironments was even higher ( r 2 = 0.964 ) indicating a common source of aerosol inside the PMRS. Since also reasonable correlation was found between fixed site monitors (FSM) and both ambient and underground photometer PM10 levels a strong influence of surface traffic-related particulate pollution on the underground air quality is suggested.

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