2026
Revealing uncertainties of on-road emissions in a mountainous city using multi-source data
Zeyu Zhang, Qiuzi Chen, Weizhen Lin, Ran Tu, Wenyu Wang, Xiaotong Zhang, An Wang# (# corresponding author)
Transportation Research Part D: Transport and Environment
Robust on-road traffic emission modeling supports carbon reduction, pollution control, and energy transition planning. While road grade surely affects individual vehicle emissions, its city-scale impact remains underexplored. This study integrates multi-source data from Hong Kong (HK)—dynamic fleet composition, spatially resolved traffic simulation, and geographic information—to capture spatiotemporal emission patterns. A...
Revealing uncertainties of on-road emissions in a mountainous city using multi-source data
Zeyu Zhang, Qiuzi Chen, Weizhen Lin, Ran Tu, Wenyu Wang, Xiaotong Zhang, An Wang# (# corresponding author)
Transportation Research Part D: Transport and Environment
Robust on-road traffic emission modeling supports carbon reduction, pollution control, and energy transition planning. While road grade surely affects individual vehicle emissions, its city-scale impact remains underexplored. This study integrates multi-source data from Hong Kong (HK)—dynamic fleet composition, spatially resolved traffic simulation, and geographic information—to capture spatiotemporal emission patterns. A...
A citywide spatiotemporal perspective of particulate matter concentration on underground subway platforms
Tianchen Qin, Ran Tu#, An Wang, Jinyitao Wang, Tianyuan Li, Suyang Xu, Xinke Li, Qiuzi Chen, Jihye Kim, Caiqing Yan, Liubing Huang, Jialiang Feng, Shunyao Wang# (# corresponding author)
npj Sustainable Mobility and Transport
Indoor air quality (IAQ) in semi-enclosed subway environments poses critical public health concerns. This study investigates IAQ in the Shanghai subway system through year-round monitoring of PM2.5 and PM10 across representative stations. Concentrations of particulate matter (PM) were markedly higher indoors, peaking during winter weekday morning rush hours, with indoor/outdoor...
A citywide spatiotemporal perspective of particulate matter concentration on underground subway platforms
Tianchen Qin, Ran Tu#, An Wang, Jinyitao Wang, Tianyuan Li, Suyang Xu, Xinke Li, Qiuzi Chen, Jihye Kim, Caiqing Yan, Liubing Huang, Jialiang Feng, Shunyao Wang# (# corresponding author)
npj Sustainable Mobility and Transport
Indoor air quality (IAQ) in semi-enclosed subway environments poses critical public health concerns. This study investigates IAQ in the Shanghai subway system through year-round monitoring of PM2.5 and PM10 across representative stations. Concentrations of particulate matter (PM) were markedly higher indoors, peaking during winter weekday morning rush hours, with indoor/outdoor...
2025
Modeling Urban Brake Wear Particle Emissions: A Ride-hailing Case in Chengdu, China
Qiuzi Chen, An Wang, Shunyao Wang, Haobing Liu, Luyang Gong, Ran Tu# (# corresponding author)
Transportation Research Part D: Transport and Environment
Brake wear particle (BWP) emissions, a major non-exhaust source of urban air pollution, will be regulated under Euro 7 standards. However, current knowledge on quantifying urban BWP emissions and their spatiotemporal variations is insufficient. This study incorporates an operating-mode-based modeling framework with large-scale ride-hailing trajectories and local survey data from...
Modeling Urban Brake Wear Particle Emissions: A Ride-hailing Case in Chengdu, China
Qiuzi Chen, An Wang, Shunyao Wang, Haobing Liu, Luyang Gong, Ran Tu# (# corresponding author)
Transportation Research Part D: Transport and Environment
Brake wear particle (BWP) emissions, a major non-exhaust source of urban air pollution, will be regulated under Euro 7 standards. However, current knowledge on quantifying urban BWP emissions and their spatiotemporal variations is insufficient. This study incorporates an operating-mode-based modeling framework with large-scale ride-hailing trajectories and local survey data from...
2024
Brake Wear Particle Emission Factors from Dynamometer Tests
Qiuzi Chen, Ran Tu# (# corresponding author)
Mendeley Data
This dataset is aimed at enhancing the value of the existing studies to support brake wear particle (BWP) emission model development. It reviews and summaries BWP emission factors (EF) and detailed information of test settings, instruments, and drive cycle parameters from dynamometer tests in the last two decades, with a...
Brake Wear Particle Emission Factors from Dynamometer Tests
Qiuzi Chen, Ran Tu# (# corresponding author)
Mendeley Data
This dataset is aimed at enhancing the value of the existing studies to support brake wear particle (BWP) emission model development. It reviews and summaries BWP emission factors (EF) and detailed information of test settings, instruments, and drive cycle parameters from dynamometer tests in the last two decades, with a...
Co-optimizing Electric Bus Dispatching and Charging Considering Limited Resources and Battery Degradation
Chenming Niu, Qiuzi Chen, Ran Tu#, Di Huang, Yujian Ye (# corresponding author)
Multimodal Transportation
This paper aims to formulate a mathematical model for a multi-type electric bus scheduling problem to determine the optimal fleet composition, bus-to-trip assignment, and partial charging schedule, where the battery degradation, nonlinear charging, and the constraint of charging station capacity are considered. A time-expanded network is proposed to represent the...
Co-optimizing Electric Bus Dispatching and Charging Considering Limited Resources and Battery Degradation
Chenming Niu, Qiuzi Chen, Ran Tu#, Di Huang, Yujian Ye (# corresponding author)
Multimodal Transportation
This paper aims to formulate a mathematical model for a multi-type electric bus scheduling problem to determine the optimal fleet composition, bus-to-trip assignment, and partial charging schedule, where the battery degradation, nonlinear charging, and the constraint of charging station capacity are considered. A time-expanded network is proposed to represent the...
2023
Cost-effective Electric Bus Resource Assignment Based on Optimized Charging and Decision Robustness
Qiuzi Chen, Chenming Niu, Ran Tu#, Tiezhu Li, An Wang, Dengbo He (# corresponding author)
Transportation Research Part D: Transport and Environment
This paper explores a cost-efficient resource assignment for urban battery-electric-buses (BEBs) considering decision robustness based on the optimized charging plan. A network flow model was proposed to minimize the operation cost with mixed fleet, nonlinear charging and the constraint of charging station capacity. A sensitivity analysis was implemented using samples...
Cost-effective Electric Bus Resource Assignment Based on Optimized Charging and Decision Robustness
Qiuzi Chen, Chenming Niu, Ran Tu#, Tiezhu Li, An Wang, Dengbo He (# corresponding author)
Transportation Research Part D: Transport and Environment
This paper explores a cost-efficient resource assignment for urban battery-electric-buses (BEBs) considering decision robustness based on the optimized charging plan. A network flow model was proposed to minimize the operation cost with mixed fleet, nonlinear charging and the constraint of charging station capacity. A sensitivity analysis was implemented using samples...