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A framework for investigating the air quality variation characteristics based on the monitoring data: Case study for Beijing during 2013–2016

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Journal of Environmental Sciences 2019年第7期31卷 225-237页

作者： Jixian Cui Jianlei Lang Tian Chen Shushuai Mao Shuiyuan Cheng Zhanshan Wang Nianliang Cheng Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental & Energy Engineering Beijing University of Technology Beijing Municipal Environmental Monitoring Center

In this study, an analysis framework based on the regular monitoring data was proposed for investigating the annual/inter-annual air quality variation and the contributions from different factors(i.e., seasons, pollution periods and airflow directions), through a case study in Beijing from 2013 to 2016. The results showed that the annual mean concentrations(MC) of PM_(2.5), SO_2, NO_2 and CO had decreased with annual mean ratios of 7.5%, 28.6%, 4.6%and 15.5% from 2013 to 2016, respectively. Among seasons, the MC in winter contributed the largest fractions(25.8%～46.4%) to the annual MC, and the change of MC in summer contributed most to the inter-annual MC variation(IMCV) of PM_(2.5) and NO2. For different pollution periods, gradually increase of frequency of S-1(PM_(2.5), 0～ 75 μg/m^3) made S-1 become the largest contributor(28.8%) to the MC of PM_(2.5) in 2016, it had a negative contribution(-13.1%) to the IMCV of PM_(2.5); obvious decreases of frequencies of heavily polluted and severely polluted dominated(44.7% and 39.5%) the IMCV of PM_(2.5). For different airflow directions, the MC of pollutants under the south airflow had the most significant decrease(22.5%～62.5%), and those decrease contributed most to the IMCV of PM_(2.5)(143.3%),SO2(72.0%), NO_2(55.5%) and CO(190.3%); the west airflow had negative influences to the IMCV of PM_(2.5), NO_2 and CO. The framework is helpful for further analysis and utilization of the large amounts of monitoring data; and the analysis results can provide scientific supports for the formulation or adjustment of further air pollution mitigation policy.

关键词： monitoring data analysis Air quality variations Airflow directions pollution periods Beijing

Quantifying Electric Vehicle Energy Consumption Benefits Across Cities: A Transferable Vehicle Energy Consumption Evaluation Framework

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SSRN 2024年

作者： Jia, Zhenyu Cao, Zeping Yin, Jiawei Wu, Lin Wei, Ning Zhang, Yanjie Jiang, Zhiwen Zhang, Qijun Mao, Hongjun Tianjin Key Laboratory of Urban Transport Emission Research & State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering Nankai University Tianjin300071 China Jinchuan Group Information and Automation Engineering Co. Ltd. Jinchang737100 China Tianjin Youmei Environment Technology Ltd. Tianjin300380 China

Vehicle electrification is an important approach worldwide for energy saving and emission reduction. However, the absence of a unified assessment method complicates the accurate quantification of energy consumption benefits from Electric Vehicles (EVs), including Plug-in Hybrid Electric Vehicles (PHEVs) and Battery Electric Vehicles (BEVs). To address this issue, the study introduces a framework for evaluating these benefits across regions based on driving cycle (DC) database and machine learning method. Tianjin and Xining, two typical cities, were used as case studies. The DC databases were iteratively generated using a 3-D Markov chain method, capturing the main driving characteristics of two cities. Energy consumption models for Internal Combustion Engine Vehicles (ICEVs), BEVs, and PHEVs achieved R2 of 0.92, 0.83, and 0.74 on the test set, respectively. The results show that EVs can achieve energy consumption benefits ranging from 16.4 % to 77.8 %. Promoting EVs in both cities yields significant energy efficiency benefits, with BEVs offering more in Tianjin, while PHEVs offer greater benefits in Xining. The model interpretation indicates that the difference stems from Tianjin's more frequent and intense deceleration and Xining's more varied terrain. The framework standardizes energy consumption assessment across vehicle types, aiding policymakers in crafting regional EVs promotion plans. © 2024, The Authors. All rights reserved.

关键词： Plug-in hybrid vehicles

Unveiling the overlooked silent threat: High-throughput suspect screening of antibiotics and multidimensional heterogeneity in aquatic ecosystems of megacity

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Journal of Hazardous Materials 2025年 493卷 138193页

作者： Guo, Tianrong Yue, Qingnan Hou, Yu Chen, Yi Yu, Dong Yang, Geng Yu, Chenglong Zeng, Yuping Feng, Yanqi Pu, Shengyan State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu610059 China Key Laboratory of Monitoring and Assessment on Novel Food Raw Materials State Administration for Market Regulation Chengdu Institute of Food Inspection Chengdu611130 China State Key Laboratory of Collaborative Control and Joint Remediation of Soil and Water Pollution for Environmental Protection College of Ecology and Environment Chengdu University of Technology Chengdu610059 China School of Materials and Environmental Engineering Chengdu Technological University Chengdu611730 China Key Laboratory of Chemical Metrology and Applications on Nutrition and Health State Administration for Market Regulation Chengdu Institute of Food Inspection Chengdu611130 China

The environmental and health impacts of antibiotics (ABx) have garnered global attention. However, the issue of ABx contamination in aquatic ecosystems of densely populated megacities remains largely overlooked. Significant research gaps persist, particularly in understanding the full-chain pollution characteristics that span from urban aquatic environments to edible aquatic organisms, due in part to the lack of systematic monitoring data to support comprehensive assessments. To address this gap, this study conducts the first comprehensive screening of ABx in the aquatic ecosystems of a megacity, offering quantitative evaluations of ABx complexity and multidimensional heterogeneity. Over a one-year period, 406 samples were collected from four rivers and three lakes, and large-scale analyses identified 37 ABx compounds, with the overall detection rate of 30.05 %, with Sulfonamides (SAs), Quinolones (QNs), and Macrolides (MLs) being the most prevalent. Surface water samples contained the greatest number of ABx types, while amphibians exhibited the highest detection rate and concentrations. A pronounced increase in detections during the dry season (spring and winter) highlighted substantial spatio-temporal variation. Source-sink analysis revealed hospital effluents and wastewater treatment plants as primary pollution sources. Among the detected compounds, Nalidixic acid (NCA), Sulfamethazine (SMTZ), Flumequine (FQ), and Tylosin (TLS) posed the most significant ecological risks, with NCA identified as a priority for targeted control. This study establishes a novel framework for the high-throughput suspect screening, occurrence pattern analysis, and risk assessment of ABx in megacities worldwide. © 2025 Elsevier B.V.

关键词： Risk assessment

The response of daytime nitrate formation to source emissions reduction based on chemical kinetic and thermodynamic model

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Science of the Total Environment 2024年 953卷 176002页

作者： Wei, Yuting Zhao, Dongheng Zhang, Zhang Li, Mei Wang, Feng Pei, Chenglei Liang, Danni Feng, Yinchang Shi, Guoliang The State Environment Protection Key Laboratory of Urban Particulate Air Pollution Prevention Tianjin Key Laboratory of Urban Transport Emission Research CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research College of Environmental Science and Engineering Cooperative Laboratory for Atmospheric Environment-Health Research Nankai University Tianjin300350 China College of Environment and Climate Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for on line source apportionment system of air pollution Jinan University Guangzhou510632 China Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou510632 China School of Environmental Science and Safety Engineering Tianjin University of Technology Tianjin300384 China Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center Guangzhou510006 China

Particulate nitrate is an important component of particulate matter and poses a significant threat to the ecosystem and human health. The gas-phase formation pathway of nitrate is extremely important, which mainly comprises the NO2 oxidation process triggered by OH radicals and the nitrate partitioning process. The response of nitrate to source emission reduction during different pollution periods remains unclear. Here, we applied the chemical kinetic and thermodynamics model to explore the importance oxidation process and partitioning process during different pollution periods based on high-time resolution observation data. The result indicated that with the aggravation of pollution, the partitioning process gradually ceases to be a limiting step in the formation of nitrates. The results of the influencing factor analysis indicate that NO2 concentration and aerosol pH values play a more significant role in the formation of nitrates. Specifically, during the clean period, nitrate formation is sensitive to both NO2 concentration and pH values, but during the pollution period, it becomes sensitive only to NO2 concentration. By combining source apportionment, we explored the response of nitrate formation to source emission reduction, and the results showed that the control of vehicle exhaust emissions and coal combustion sources is more effective in mitigating nitrate pollution. Additionally, this study also emphasized the importance of early prevention and control of pollution sources. This research provides scientific evidence for the precise management and control of nitrates. © 2024 Elsevier B.V.

关键词： Nitrate production Gas phase Haze episode Source apportionment Chemical kinetic model Thermodynamics model

G-Quadruplex Dimer-Enhanced Crispr/Cas12a Microfluidic Chip Aptasensor for Rapid, Label-Free Detection of Salmonella Typhimurium

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SSRN 2025年

作者： Tan, Huimin Man, Yan Du, Yuanfang Yu, Zhou Shi, Cong Ma, Shuai Wang, Yun Tang, Zhenchuang Zhang, Qinghai School of Public Health The key Laboratory of Environmental Pollution Monitoring and Disease Control Guizhou Medical University Guizhou China Institute of Quality Standard and Testing Technology Beijing Academy of Agriculture and Forestry Sciences Beijing China Institute of Chinese Materia Medica China Academy of Chinese Medical Sciences Beijing China Institute of Food and Nutrition Development Ministry of Agriculture and Rural Affairs Beijing China

This study presents an innovative microfluidic chip-based fluorescent aptasensor that combines G-quadruplex (G4) dimer enhancement with CRISPR/Cas12a technology for rapid, label-free detection of S. typhimurium. The system features a novel design incorporating self-assembled, replaceable reagent pre-stored tubes and an automated micromixing module with diamond-shaped microcolumns arranged in a "contraction-expansion" channel configuration. This design eliminates the need for complex microvalves while enabling efficient multi-step reactions. Our G4 dimer-enhanced microfluidic CRISPR/Cas12a aptasensor achieved remarkable performance metrics, including a broad linear detection range (3.6×10¹ to 3.6×10⁶ CFU/mL) and a low detection limit of 36 CFU/mL. The sensor demonstrated excellent specificity for S. typhimurium and proved highly effective in analyzing spiked food samples, including milk, pre-cut vegetables, and chicken, with recovery rates of 88.11-105.19%. The integration of G4 dimer enhancement significantly improved both the signal-to-noise ratio and detection accuracy. This innovative platform represents a significant advancement in automated, rapid, and highly sensitive detection methods for foodborne pathogens in food safety applications. © 2025, The Authors. All rights reserved.

关键词： Salmonella

Double Network Self-Healing Hydrogels Based on Carboxyethyl Chitosan/Oxidized Sodium Alginate/Ca2+: Preparation, Characterization and Application in Dye Absorption

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SSRN 2023年

作者： Zhang, Linyu Li, Qianqi Bai, Xinru Li, Xiaoqin Zhang, Guoguang Zou, Jinmei Fei, Peng Lai, Wenqiang Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province Key Laboratory of Pollution Monitoring and Control of Fujian Province College of Chemistry Chemical Engineering and Environment Minnan Normal University Zhangzhou363000 China Research Institute of Zhangzhou-taiwan Leisure Food and Tea Beverage School of Biological Science and Biotechnology Minnan Normal University Zhangzhou363000 China

This paper presents the formation of a self-healing hydrogel prepared by carboxyethyl modification of chitosan and crosslinking with oxidized sodium alginate. Concurrently, the incorporation of Ca2+ facilitated the formation of "calcium bridges" through intricate coordination with carboxyl moieties, bolstering the attributes of the *** characterization methods, including scanning electron microscopy, texture analysis, and rheological measurements, demonstrated that the introduction of carboxyethyl groups resulted in a more compact hydrogel network structure and improved the hardness and elasticity. The addition of Ca2+ helped to further enhance the mechanical performance of the hydrogel and increase its thermal ***, the adsorption capacity was also investigated, showing adsorption capacities of 40.55 mg/L methylene blue and 46.44 mg/L congo red for carboxyethyl chitosan / oxidized sodium alginate hydrogel, a four-fold increase for congo red versus chitosan / oxidized sodium alginate ***, the hydrogel can be recovered within 12 hours of cutting, which proves that the hydrogel has self-healing ability and ensures its reusability. © 2023, The Authors. All rights reserved.

关键词： Chitosan

Marine Modulation of the Formation Pathways and Sources of Organosulfates over the Coastal South China Sea

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Environmental Science & technology Letters 2025年第6期12卷 739-746页

作者： Yucheng Zhu Hao Li Junjie Wei Hao Ding Dongmei Cai Xuan Zou Guochen Wang Qiongzhen Wang Zhijian Ding Ziwei Liu Jia Chen Long Yun Congrui Deng Kan Huang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary Department of Environmental Science and Engineering Fudan University Shanghai 200433 China Key Laboratory of Environmental Pollution Control Technology of Zhejiang Province Hangzhou Zhejiang 310025 China；Environmental Science Research & Design Institute of Zhejiang Province Hangzhou Zhejiang 310007 China Shanghai Environment Monitoring Center Shanghai 200030 China Shenzhen Environment Monitoring Center Shenzhen Guangdong 518049 China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary Department of Environmental Science and Engineering Fudan University Shanghai 200433 China；Institute of Eco-Chongming Shanghai 202162 China；IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan University Shanghai 200433 China；Observation and Research Station of Huaniaoshan East China Sea Ocean-Atmosphere Integrated Ecosystem Ministry of Natural Resources Shanghai 200136 China

Organosulfates (OSs) constitute a considerable part of airborne sulfur-containing organic aerosols, influencing aerosol physicochemical properties, biogeochemical cycles, and climate. This study investigated the compositions, formation pathways, and sources of OSs at a coastal site of the South China Sea in summer. Thirty-three OS species were quantified by using an UHPLC-Orbitrap MS and were assessed under marine and terrestrial air mass origins. iOSs (isoprene-derived OSs) ranked the highest, followed by C2/C3 OSs (OSs with two or three carbon atoms). The formation of iOSs was influenced by aerosol pH and their major precursor (isoprene), with photochemical processes playing a significant role in terrestrial transport. Different from urban conditions, sea breezes favored the formation of 2-MAS (C4H7O7S–) over 2-MTS (C5H11O7S–) even under low NOxlevels, mainly attributed to the high temperature and dominance of aqueous oxidation. Compared to terrestrial transport, the formation of C2/C3 OSs was more favored than that of iOSs under the influence of sea breezes. Marine biogenic emission was quantified as an important source of C2/C3 OSs. This study enhances our understanding of the influence of both terrestrial and marine factors on the formation pathways of atmospheric OSs and emphasizes the significant contribution of marine biogenic sources to OSs.

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Micropores can enhance intrinsic fracture energy of hydrogels

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arXiv

arXiv 2024年

作者： Cao, Puyu Chen, Bin Cao, Yi Gao, Huajian Department of Engineering Mechanics Zhejiang University Hangzhou China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Hangzhou China School of Physics Nanjing University Nanjing China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Mechano-X Institute Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing100084 China

It is widely known that hydrogels, a class of soft materials made of a polymer chain network, are prone to fatigue failure. To understand the underlying mechanism, here we simulate polymer scission and fatigue initiation in the vicinity of a crack tip in a two-dimensional chain network. For a network without pores, our findings reveal that polymer scission can take place across multiple layers of chains, rather than just a single layer as assumed in the classical Lake-Thomas theory, in consistency with previus studies. For a network with a high density of micropores, our results demonstrate that the pores can substantially enhance the intrinsic fracture energy of the network in direct proportion to the pore size. The underlying mechanism is attributed to pore-pore interactions which lead to a relatively uniform distribution of cohesive energy ahead of the crack tip. Our model suggests that micropores could be a promising strategy for improving the intrinsic fracture energy of hydrogels and that natural porous tissues may have evolved for enhanced fatigue resistance. Copyright © 2024, The Authors. All rights reserved.

关键词： Crack tips

Spatiotemporal Patterns and Synergy of the Environmental Rebound Effect: Evidence from Carbon Emissions and Pm2.5 pollution in China

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SSRN 2024年

作者： Han, Xiao Wang, Yichen Du, Mingxi Tian, Chenguang Xie, Meiying Zhang, Linru Jiang, Yingkun School of Public Policy and Administration Xi’an Jiaotong University 28 Xianning Road West Shaanxi Xi’an710049 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Jiangsu Nanjing210044 China Xi’an Institute for Innovative Earth Environment Research Shaanxi Xi’an710061 China

technology progress is one of the most attractive measures to tackling the dual pressures of carbon reduction and fine particulate matter (PM2.5) pollution control. However, due to the existence of the environmental rebound effect (ERE), such technical efforts are limited. The spatiotemporal patterns and synergy of the ERE for carbon and PM2.5 emissions have not been thoroughly explored, thereby hindering the realization of co-abatement strategies. This study employs the growth accounting approach to estimate the ERE across 30 provinces in China from 2001 to 2019. The average magnitude of the rebound effect for carbon emissions (CRE) reached 125.45%, while that for PM2.5 pollution (PRE) was 45.01%. CRE and PRE substantially offset the potential savings, particularly the backfire effect of carbon emissions. The degrees of both CRE and PRE experienced a generally diminishing trend over the studied period, with significant heterogeneity in the spatial distribution pattern. Additionally, we find that the synergistic reduction effect between CRE and PRE was approximately 0.97, and that the synergy grades of the eastern coastal as well as central regions were higher than that of the western region. These findings enhance the understanding of the intertwined relationship between carbon and PM2.5 reductions from the perspective of the ERE, providing crucial references for collaborative governance and the further achievement of sustainable development goals. © 2024, The Authors. All rights reserved.

关键词： Carbon