Objective To evaluate the air quality in the compartments of three models of electric multiple unit (EMU) trains.
Methods CRH5,CRH380A,and CRH380BL EMU models were monitored and analyzed for micro-climate indices (including temperature,relative humidity,and wind speed) and pollutants (including carbon monoxide,carbon dioxide,particles,total bacteria,formaldehyde,and volatile organic compounds).
Results The qualified rates of temperature,relative humidity,and wind speed were 78.4%,94.0%,and 100% respectively.The particles in compartments and supply air of selected models were mostly composed of PM1.0.The particle concentration in compartments was strongly associated with that in the supply air.The concentrations of carbon monoxide,formaldehyde,volatile organic compounds,and total bacteria count were well within the relevant national standards,except for carbon dioxide concentration.
Conclusion The air qualities in the compartments of three selected EMU models are good in general.However,the qualified rates of carbon dioxide concentrations in the compartments are relatively low.
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