Objective To investigate and analyze the air quality in the air-conditioned train under different passenger load conditions.
Methods Referring to the relevant standards and rules, the micro-climate and air quality of the air-conditioned passenger trains were monitored continuously. The measured data was analyzed with SPSS16.0. The results were evaluated with the Air Quality Index Method.
Results When the air-conditioned train compartment was underloaded, the air quality index was in grade Ⅱ , the air quality was still clean. When the compartment was overloaded, the air quality index was in grade Ⅲ , the air quality was lightly polluted. The maximum value of all air quality sub-indices(Imax)showed that CO2 was the primary pollutant. The exceeding rate of CO2 concentration was 100% whether the compartment was underloaded or overloaded. The exceeding rates of temperature and relative humidity in the compartment during overloading were 40.0% and 27.8%, significantly higher than during underloading(P<0.01). With the increase of the passenger number, CO2 concentration increased, but CO concentration and the temperature decreased, the Spearman rank correlation coefficients were 0.549,-0.449 and-0.349 respectively(P<0.01).
Conclusion The air quality in an overloaded compartment was worse than underloaded one in air-conditioned passenger train.
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