title: Air quality in passenger cars of the ground railway transit system in Beijing, China.
abstract: This study examined the concentrations of carbon monoxide, carbon dioxide, TVOC, TSP, PM(10), PM(2.5), PM(1), benzene, toluene and xylene in passenger cars of the Beijing Ground Railway Transit System (Line No. 13). This system connects the northern suburb and downtown, and is equipped with air-conditioned passenger cars. In-train air quality monitoring was performed in both summer (July and August) and winter (December). To obtain representative data, the sampling design considered both rush and regular hours, urban and suburban areas, as well as the number of passengers. Meanwhile, questionnaires were distributed to the passengers. The monitoring results indicated that, overall, the air quality in the passenger cars was acceptable with a few exceptions, which is consistent with the passengers' perception. Concentrations of some air pollutants showed significant seasonal variations and had the significant difference between rush hour and regular hour. Furthermore, the in-train air quality was greatly influenced by the number of passengers. This paper describes the experimental design, and presents the preliminary results.
authors.affiliation: Department of Environmental Science, College of Environmental Science, Peking University, Beijing, China. litiantian@water.pku.edu.cn
authors.forename: Tian-Tian
authors.initials: TT
authors.lastname: Li
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Bai
authors.forename: Zhao-Rong
authors.initials: ZR
authors.lastname: Liu
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Liu
authors.forename: Guang-Shan
authors.initials: GS
authors.lastname: Zhang
authors.forename: Jin-Long
authors.initials: JL
authors.lastname: Li
mesh_terms: D000388:Air / Q000032:analysis / Q000592:standards*; D000389:Air Conditioning; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D018986:Motor Vehicles / Q000592:standards*; D011786:Quality Control; D012621:Seasons; D014507:Urbanization
chemical_list: D000393:Air Pollutants