Travel behaviour changes under Work-from-home (WFH) arrangements during COVID-19

Travel Behaviour and Society, Journal Year: 2022, Volume and Issue: 30, P. 202 - 211

Published: Sept. 30, 2022

Language: Английский

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Insights into the significant increase in ozone during COVID-19 in a typical urban city of China

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(7), P. 4853 - 4866

Published: April 12, 2022

Abstract. The outbreak of COVID-19 promoted strict restrictions to human activities in China, which led a dramatic decrease most air pollutant concentrations (e.g., PM2.5, PM10, NOx, SO2 and CO). However, an obvious increase ozone (O3) was found during the lockdown period urban areas China. In this study, we conducted field measurements targeting its key precursors by utilizing novel proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) Changzhou, is representative Yangtze River Delta (YRD) city cluster We further applied integrated methodology including machine learning, observation-based model (OBM) sensitivity analysis obtain insights into reasons causing ozone. Major findings include following: (1) deweathered calculation, changes precursor emissions contributed 1.46 ppbv observed O3 full-lockdown 2020, while meteorology constrained 3.0 2019. (2) By using OBM, that although significant reduction period, photochemical formation stronger than pre-lockdown period. (3) NOx/VOC ratio dropped dramatically from 1.84 0.79 switched VOC-limited regime boundary NOx- regime. Additionally, box results suggested could mean 2.4 ppbv. Results study give relationship between area demonstrate for China This also underlines necessity controlling anthropogenic oxygenated volatile organic compounds (OVOCs), alkenes aromatics sustained campaign reducing pollution

Language: Английский

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Impact of COVID-19 Pandemic on Air Quality: A Systematic Review

International Journal of Environmental Research and Public Health, Journal Year: 2022, Volume and Issue: 19(4), P. 1950 - 1950

Published: Feb. 10, 2022

With the emergence of COVID-19 pandemic, several governments imposed severe restrictions on socio-economic activities, putting most world population into a general lockdown in March 2020. Although scattered, studies this topic worldwide have rapidly emerged literature. Hence, systematic review aimed to identify and discuss scientifically validated literature that evaluated impact pandemic associated air quality. Thus, total 114 quantified quality through monitoring were selected from three databases. The countries India China; all intended evaluate quality, mainly concerning PM10, PM2.5, NO2, O3, CO, SO2. Most them focused 1st lockdown, comparing with pre- post-lockdown periods usually urban areas. Many conducted descriptive analysis, while others complemented it more advanced statistical analysis. using different methodologies, some reported temporary improvement during lockdown. More are still needed, lifting and, other areas, for definition better-targeted policies reduce pollution.

Language: Английский

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Investigating the association between air pollutants’ concentration and meteorological parameters in a rapidly growing urban center of West Bengal, India: a statistical modeling-based approach

Modeling Earth Systems and Environment, Journal Year: 2023, Volume and Issue: 9(2), P. 2877 - 2892

Published: Jan. 5, 2023

Language: Английский

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Quantification of COVID-19 impacts on NO2 and O3: Systematic model selection and hyperparameter optimization on AI-based meteorological-normalization methods

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 301, P. 119677 - 119677

Published: Feb. 27, 2023

Language: Английский

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Effects of COVID-19 on coastal and marine environments: Aggravated microplastic pollution, improved air quality, and future perspective

Chemosphere, Journal Year: 2024, Volume and Issue: 355, P. 141900 - 141900

Published: April 3, 2024

Language: Английский

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Spatiotemporal impact of COVID-19 on Taiwan air quality in the absence of a lockdown: Influence of urban public transportation use and meteorological conditions

Journal of Cleaner Production, Journal Year: 2022, Volume and Issue: 365, P. 132893 - 132893

Published: June 27, 2022

Language: Английский

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COVID-19 effects on transport-related air pollutants: insights, evaluations, and policy perspectives

Transport Reviews, Journal Year: 2023, Volume and Issue: 44(2), P. 484 - 517

Published: June 19, 2023

This study analyses the relationship between Covid-19 and air pollutants resulting from transportation activities by addressing two research questions. First, it examines quantitative impacts of on emissions/concentrations. In this case, results are dependent temporal horizon political measures introduced to control virus. Greenhouse gases (GHGs) nitrogen oxides (NOx) exhibit a strong correlation with reduced road traffic, while influence other criteria (CO, SO2, PMx) is not univocally demonstrated. Second, specific modes (e.g. transport), systems public sectors freight transport). The generalised decrease in emissions consequence travel demand; however, true for sectors, such as last-mile delivery or private flights, which show an increase emissions. Moreover, unitary values register most cases, indicating reduction environmental effectiveness due modal shift towards solutions transport occupancy rates. post-pandemic world, significant issue arises when demand increases but share less responsive returning previous levels. Several lines stem these outcomes, ranging technical issues modelling safety perception choice) evaluation curbing mobility adopting fuel regulations). Another promising area involves exploring combination transport-related drivers, automation alternative fuels. Additionally, investigating coherence effects long-term decarbonisation policies important direction.

Language: Английский

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The spatiotemporal variation of PM2.5-O3 association and its influencing factors across China: Dynamic Simil-Hu lines

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 880, P. 163346 - 163346

Published: April 7, 2023

Language: Английский

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Changes in Air Quality from the COVID to the Post-COVID Era in the Beijing-Tianjin-Tangshan Region in China

Aerosol and Air Quality Research, Journal Year: 2021, Volume and Issue: 21(12), P. 210270 - 210270

Published: Jan. 1, 2021

This article discussed air quality changes in the Beijing-Tianjin-Tangshan (BTT) region. The index (AQI) values, and concentrations of PM2.5, PM10, SO2, CO, NO2, O3 BTT region during COVID-19 outbreak 2020 were, respectively, 79.4, 47.2 μg m-3, 73.4 10.3 0.87 mg 33.6 90.7 m-3. However, they 102.7, 61.4 121.0 9.0 0.88 40.1 84.0 m-3 same period 2021, which is an increase 29.2%, 30.1%, 64.8%, -12.9%, 1.94 %, 19.5%, -7.4% compared with values 2020. combined proportions grade I II were 16.7% higher than those so has deteriorated rapidly from to post-COVID era 2021. possible reasons for poorer are that frequency dusty weather pollutant discharge increased, meteorological conditions have been relatively unfavorable. average AQI 2021 respectively decreased by 14.8%, 29.0%, 14.6%, 22.5%, 37.4%, 8.7%, It also worth noting all pollution consistent. 18.4% 2020, indicates obviously improved a series clean policies actions, as well favorable atmospheric diffusion conditions. These results indicate play very important role improving quality.

Language: Английский

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