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Quantification of emission variability for off-road equipment in China based on real-world measurements

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Abstract

The objective of this paper is to quantify the variability in emissions of off-road equipment using a portable emission measurement system. A total of 53 commonly used equipment for agriculture, base construction, paving construction, and material handling were selected. Time-based and fuel-based emissions were quantified by different duty and engine modes. Three duty modes (idling, moving, and working) were used. Ten engine modes were defined based on normalized engine revolutions-perminute and manifold absolute pressure, respectively. Composite emission factors taking into account both duty modes and its corresponding time percentage during a typical duty cycle were estimated. Results showed that there existed a large off-road equipment variability in emissions. Depending on duty and engine modes, time-based NO emissions ranged from 3.1 to 237.9,29.1–1475.6, 83.2–681.6, and 3.2–385.2 g/h for agriculture, base construction, paving construction and material handling equipment, respectively while for fuel-based NO emissions these ranges were 5.3–52.0, 11.7–69.0, 4.8–30.8, and 11.0–54.6 g/kg, respectively. Furthermore, emission factors derived from this study exhibited a much larger variability compared to those used in NONROAD by US EPA and National Guideline for Off-road Equipment of China. This implied that localized measurements of emissions are needed for improvement of accuracy of emission inventory. Furthermore, both equipment types and operations should be considered for development of emission inventory and control strategy.

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Acknowledgements

The authors thank all the members of Atmospheric Modeling and Environmental Data Analysis research group at Sichuan University for their helps in real-world emission measurements in this study. This work was supported by the Public Environmental Service Project of the Ministry of Environmental Protection of PRC (No. 201409012) and the Research Project of the Bureau of Science and Technology of Sichuan (No. 2019YFS0498). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsor and the university.

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Authors and Affiliations

  1. Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China

    Kaili Pang, Kaishan Zhang, Shuai Ma & Xiangrui Meng

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  1. Kaili Pang
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  2. Kaishan Zhang
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  3. Shuai Ma
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  4. Xiangrui Meng
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Correspondence to Kaishan Zhang.

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Highlights

• Emissions from 53 in-use diesel-fueled off-road equipment were measured.

• There exists a large off-road equipment variability in emissions.

• Engine operations have significant impacts on real-world tailpipe emissions.

• Emission inventory development should take into account job duties and operations.

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Pang, K., Zhang, K., Ma, S. et al. Quantification of emission variability for off-road equipment in China based on real-world measurements. Front. Environ. Sci. Eng. 16, 24 (2021). https://doi.org/10.1007/s11783-021-1455-x

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  • DOI: https://doi.org/10.1007/s11783-021-1455-x

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