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Vehicular emissions and concentrations in school zones: A case study

  • Geological, Civil, Energy and Traffic Engineering
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Abstract

Recent research has revealed that human exposure to air pollutants such as CO, NO X , and particulates can lead to respiratory diseases, especially among school-age children. Towards understanding such health impacts, this work estimates local-scale vehicular emissions and concentrations near a highway traffic network, where a school zone is located in. In the case study, VISSIM traffic micro-simulation is used to estimate the source of vehicular emissions at each roadway segment. The local-scale emission sources are then used as inputs to the California line source dispersion model (CALINE4) to estimate concentrations across the study area. To justify the local-scale emissions modeling approach, the simulation experiment is conducted under various traffic conditions. Different meteorological conditions are considered for emission dispersion. The work reveals that emission concentrations are usually higher at locations closer to the congested segments, freeway ramps and major arterial intersections. Compared to the macroscopic estimation (i.e. using network-average emission factors), the results show significantly different emission patterns when the local-scale emission modeling approach is used. In particular, it is found that the macroscopic approach over-estimates emission concentrations at freeways and under-estimations are observed at arterials and local streets. The results of the study can be used to compare to the US environmental protection agency (EPA) standards or any other air quality standard to further identify health risk in a fine-grained manner.

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Correspondence to Zhan-bo Sun  (孙湛博).

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Alzuhairi, A., Aldhaheri, M., Sun, Zb. et al. Vehicular emissions and concentrations in school zones: A case study. J. Cent. South Univ. 23, 1778–1785 (2016). https://doi.org/10.1007/s11771-016-3231-9

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  • DOI: https://doi.org/10.1007/s11771-016-3231-9

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