Heavy-duty vehicles dominate expressway tunnel environment analysis and emission factor determination

IF 7.3 1区工程技术 Q1 ENVIRONMENTAL STUDIES

Transportation Research Part D-transport and Environment Pub Date : 2025-02-01 DOI:10.1016/j.trd.2024.104554

Dengkai Tu , Jingchao Xie , Henan Chai , Ren Zhang , Yansheng Zhi , Jiaping Liu

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引用次数: 0

Abstract

Vehicle emission factors (EFs) are important factors affecting tunnel environments. In this study, field tests were conducted in an expressway tunnel in southwest China. The percentage of heavy-duty vehicles (HDVs) was approximately 38 %. The NO_x concentrations exceeded the safety thresholds. The average CO, NO_x, and PM_2.5 EFs of the mixed fleet were 1.25, 2.68, and 0.079 g/km veh⁻¹, respectively. The NO_x and PM_2.5 EFs of the HDV were 31.3 and 14.7 times higher than those of the light-duty vehicle (LDV), respectively. HDVs contributed 61.5 % to CO, 94.8 % to NO_x, and 89.3 % to PM_2.5 emissions in this investigation. When compared to previous studies, a significant reduction in CO and PM was observed, but NO_x remained at a high level. Stricter policies are needed to control the emissions of HDVs, and the ventilation of tunnels must consider the NO_x concentration.

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来源期刊

Transportation Research Part D-transport and Environment 工程技术-运输科技

CiteScore

14.40

自引率

9.20%

发文量

314

审稿时长

39 days

期刊介绍： Transportation Research Part D: Transport and Environment focuses on original research exploring the environmental impacts of transportation, policy responses to these impacts, and their implications for transportation system design, planning, and management. The journal comprehensively covers the interaction between transportation and the environment, ranging from local effects on specific geographical areas to global implications such as natural resource depletion and atmospheric pollution. We welcome research papers across all transportation modes, including maritime, air, and land transportation, assessing their environmental impacts broadly. Papers addressing both mobile aspects and transportation infrastructure are considered. The journal prioritizes empirical findings and policy responses of regulatory, planning, technical, or fiscal nature. Articles are policy-driven, accessible, and applicable to readers from diverse disciplines, emphasizing relevance and practicality. We encourage interdisciplinary submissions and welcome contributions from economically developing and advanced countries alike, reflecting our international orientation.