Online characterization of primary and secondary emissions of particulate matter and acidic molecules from a modern fleet of city buses

Zhou, Liyuan; Liu, Qianyun; Salvador, Christian M.; Le Breton, Michael; Hallquist, Mattias; Yu, Jian Zhen; Chan, Chak K.; Hallquist, Åsa M.

doi:10.5194/acp-24-11045-2024

Title: Online characterization of primary and secondary emissions of particulate matter and acidic molecules from a modern fleet of city buses

Journal Article · 02 October 2024 · Atmospheric Chemistry and Physics (Online)

DOI: https://doi.org/10.5194/acp-24-11045-2024 · OSTI ID:2472680

Zhou, Liyuan ^[1];

^[2]; Salvador, Christian M. ^[3]; Le Breton, Michael ^[4];

^[5];

^[6];

^[1]; Hallquist, Åsa M. ^[7]

King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia); City Univ. of Hong Kong (Hong Kong)
City Univ. of Hong Kong (Hong Kong); RELX Science Center, Shenzhen (China)
Univ. of Gothenburg (Sweden); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Gothenburg (Sweden); FEV Sverige AB, Gothenburg (Sweden)
Univ. of Gothenburg (Sweden)
Hong Kong University of Science and Technology (HKUST) (Hong Kong)
IVL Swedish Environmental Research Institute (Sweden)

The potential impact of transitioning from conventional fossil fuel to a non-fossil-fuel vehicle fleet was investigated by measuring primary emissions via extractive sampling of bus plumes and assessing secondary mass formation using the Gothenburg Potential Aerosol Mass (Go:PAM) reactor from 76 in-use transit buses. Online chemical characterization of gaseous and particulate emissions from these buses was conducted using chemical ionization mass spectrometry (CIMS) with acetate as the reagent ion, coupled with the Filter Inlet for Gases and AEROsols (FIGAERO). Acetate reagent ion chemistry selectively ionizes acidic compounds, including organic and inorganic acids, as well as nitrated and sulfated organics. A significant reduction (48 %–98 %) in fresh particle emissions was observed in buses utilizing compressed natural gas (CNG), biodiesels like rapeseed methyl ester (RME) and hydrotreated vegetable oil (HVO), and hybrid-electric HVO (HVO_HEV) compared to diesel (DSL). However, secondary particle formation from photooxidation of emissions was substantial across all the fuel types. The median ratio of particle mass emission factors of aged to fresh emissions increased in the following order: DSL buses at 4.0, HVO buses at 6.7, HVO_HEV buses at 10.5, RME buses at 10.8, and CNG buses at 84. Of the compounds that can be identified by CIMS, fresh gaseous emissions from all Euro V/EEV (Enhanced Environmentally friendly Vehicle) buses, regardless of fuel type, were dominated by nitrogen-containing compounds such as nitrous acid (HONO), nitric acid (HNO₃), and isocyanic acid (HNCO), alongside small monoacids (C₁–C₃). Notably, the emission of nitrogen-containing compounds was lower in Euro VI buses equipped with more advanced emission control technologies. Secondary gaseous organic acids correlated strongly with gaseous HNO₃ signals (R²=0.85–0.99) in Go:PAM, but their moderate to weak correlations with post-photooxidation secondary particle mass suggest that they are not reliable tracers of secondary organic aerosol formation from bus exhaust. Our study highlights that non-regulated compounds and secondary pollutant formation, not currently addressed in legislation, are crucial considerations in the evaluation of environmental impacts of future fuel and engine technology shifts.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2472680

Journal Information:: Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Journal Issue: 19 Vol. 24; ISSN 1680-7324

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: United States

Language:: English

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