Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China

Wang, Honglei; Miao, Qing; Shen, Lijuan; Yang, Qi; Wu, Yezheng; Wei, Heng; Yin, Yan; Zhao, Tianliang; Zhu, Bin; Liu, Wen

doi:10.1016/j.jes.2020.09.019

Cited by 34 publications

(40 citation statements)

References 58 publications

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“…In all examined periods, the morning traffic peak in absorption clearly prevails, while during the lockdown, the traffic peak appears largely reduced and an hour earlier (07:00 LST) (Figure 6e), probably due to the absence of go-to-work traffic congestion. Similarly, a flat diurnal cycle of BC was noticed in Suzhou, Yangtze River Delta, China during the lockdown period, indicating the remarkable decrease in traffic and the disappearance of the morning and evening traffic-related peaks [41]. During the lockdown night hours, b abs,520 displayed much lower decrease fractions (about 10% with respect to previous years), as the decrease in nighttime traffic emissions is somewhat counterbalanced by a slight intensification of wood combustion.…”

Section: Changes In Diurnal Aerosol Patterns During Lockdown Pre-andmentioning

confidence: 72%

“…However, in areas significantly impacted by seasonal biomass burning or dust aerosols, AODs may remain unaffected or even increase during the lockdown period [36,37]. Beyond gaseous pollutants and AOD, there are some studies analyzing the changes in BC concentrations during the lockdown period [26,[38][39][40][41][42], which reported significant reductions (30-70%), but with large variability among regions. On the contrary, only a few works examined the changes in aerosol spectral absorption [43,44], while there is a lack of studies related to changes in spectral-scattering and single-scattering albedo (SSA).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the COVID-19 Lockdown Effects on Spectral Aerosol Scattering and Absorption Properties in Athens, Greece

et al. 2021

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COVID-19 is evolving into one of the worst pandemics in recent history, claiming a death toll of over 1.5 million as of December 2020. In an attempt to limit the expansion of the pandemic in its initial phase, nearly all countries imposed restriction measures, which resulted in an unprecedented reduction of air pollution. This study aims to assess the impact of the lockdown effects due to COVID-19 on in situ measured aerosol properties, namely spectral-scattering (bsca) and absorption (babs) coefficients, black carbon (BC) concentrations, single-scattering albedo (SSA), scattering and absorption Ångström exponents (SAE, AAE) in Athens, Greece. Moreover, a comparison is performed with the regional background site of Finokalia, Crete, for a better assessment of the urban impact on observed differences. The study examines pre-lockdown (1–22 March 2020), lockdown (23 March–3 May 2020) and post-lockdown (4–31 May 2020) periods, while the aerosol properties are also compared with a 3–4 year preceding period (2016/2017–2019). Comparison of meteorological parameters in Athens, between the lockdown period and respective days in previous years, showed only marginal variation, which is not deemed sufficient in order to justify the notable changes in aerosol concentrations and optical properties. The largest reduction during the lockdown period was observed for babs compared to the pre-lockdown (−39%) and to the same period in previous years (−36%). This was intensified during the morning traffic hours (−60%), reflecting the large decrease in vehicular emissions. Furthermore, AAE increased during the lockdown period due to reduced emissions from fossil-fuel combustion, while a smaller (−21%) decrease was observed for bsca along with slight increases (6%) in SAE and SSA values, indicating that scattering aerosol properties were less affected by the decrease in vehicular emissions, as they are more dependent on regional sources and atmospheric processing. Nighttime BC emissions related to residential wood-burning were slightly increased during the lockdown period, with respect to previous-year means. On the contrary, aerosol and pollution changes during the lockdown period at Finokalia were low and highly sensitive to natural sources and processes.

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Section: Changes In Diurnal Aerosol Patterns During Lockdown Pre-andmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Assessment of the COVID-19 Lockdown Effects on Spectral Aerosol Scattering and Absorption Properties in Athens, Greece

et al. 2021

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“…China: (Agarwal et al, 2020;Chauhan and Singh, 2020;Chen et al, 2020a;Chen et al, 2020c;Chen et al, 2020d;Fan et al, 2020;G Huang and Sun, 2020;Lian et al, 2020;Liu et al, 2020c;Miyazaki et al, 2020;Nichol et al, 2020;Pei et al, 2020;Shakoor et al, 2020;Shi and Brasseur, 2020;Silver et al, 2020;Wan et al, 2020;Wang et al, 2020a;Wang et al, 2020b;Wang et al, 2020f;Xu et al, 2020c;Zhang et al, 2020a;Yuan et al, 2021) Other: (Ghahremanloo et al, 2020;Han et al, 2020;Ju et al, 2020;Ma and Kang, 2020;Zhang et al, 2020b) South Asia India: (Bedi et al, 2020;Beig et al, 2020;Biswal et al, 2020;Chatterjee et al, 2020;Gautam et al, 2020;Harshita and Vivek, 2020;Jain and Sharma, 2020;Kant et al, 2020;Kumari and Toshniwal, 2020;Panda et al, 2020;Ranjan et al, 2020;Selvam et al, 2020;Sharma et al, 2020a;Siddiqui et al, 2020;Singh and Chauhan, 2020;…”

Section: East Asiaunclassified

The global impacts of COVID-19 lockdowns on urban air pollution

Gkatzelis

Gilman

Brown

et al. 2021

Elementa: Science of the Anthropocene

123

154

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The coronavirus-19 (COVID-19) pandemic led to government interventions to limit the spread of the disease which are unprecedented in recent history; for example, stay at home orders led to sudden decreases in atmospheric emissions from the transportation sector. In this review article, the current understanding of the influence of emission reductions on atmospheric pollutant concentrations and air quality is summarized for nitrogen dioxide (NO2), particulate matter (PM2.5), ozone (O3), ammonia, sulfur dioxide, black carbon, volatile organic compounds, and carbon monoxide (CO). In the first 7 months following the onset of the pandemic, more than 200 papers were accepted by peer-reviewed journals utilizing observations from ground-based and satellite instruments. Only about one-third of this literature incorporates a specific method for meteorological correction or normalization for comparing data from the lockdown period with prior reference observations despite the importance of doing so on the interpretation of results. We use the government stringency index (SI) as an indicator for the severity of lockdown measures and show how key air pollutants change as the SI increases. The observed decrease of NO2 with increasing SI is in general agreement with emission inventories that account for the lockdown. Other compounds such as O3, PM2.5, and CO are also broadly covered. Due to the importance of atmospheric chemistry on O3 and PM2.5 concentrations, their responses may not be linear with respect to primary pollutants. At most sites, we found O3 increased, whereas PM2.5 decreased slightly, with increasing SI. Changes of other compounds are found to be understudied. We highlight future research needs for utilizing the emerging data sets as a preview of a future state of the atmosphere in a world with targeted permanent reductions of emissions. Finally, we emphasize the need to account for the effects of meteorology, emission trends, and atmospheric chemistry when determining the lockdown effects on pollutant concentrations.

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“…Para controlar el impacto de la pandemia causada por Covid-19 en todo el mundo se han aplicado restricciones a todo nivel (Wang et al, 2021)y especialmente en a las actividades que se pueden ejecutar como un trabajo en casa (Mheidly et al, 2020). El trabajo se concentró en un 34% a teletrabajo (Peiró y Soler, 2020) y a porcentajes cerca del 59,9% en actividades académicas e intelectuales.…”

Section: Introductionunclassified

Evaluación de la carga y fatiga mental en docentes por teletrabajo a causa del COVID-19

Villacís

Suárez

Puca³

et al. 2021

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Introducción: Se realizó un estudio de carga mental a 103 docentes de distintas universidades del centro del Ecuador utilizando para esto el método NASA-Task Load Index (LTX), en el estudio se cuantificó la exigencia mental, física, temporal, esfuerzo, rendimiento y el nivel de frustración a diferentes grupos de edades, para detectar el factor de riesgo psicosocial y incidencia en la fatiga normal y fatiga crónica. Métodos: Se utilizó una muestra de 103 docentes universitarios divididos en 9 segmentos de edades y de distintas instituciones educativas de la zona centro del Ecuador que ejecutan actividades de enseñanza aprendizaje en modalidad de teletrabajo. Primero se les aplicó una encuesta según el método NASA-Task Load Index (LTX) para cuantificar los 6 factores o dimensiones que considera el método. Luego se aplicó un cuestionario de salud relacionado a la carga mental simple y crónica. Esta investigación se efectuó en dos fases, la primera de ponderación y la segunda de puntuación. Resultados: La aplicación del método NASA LTX logró detectar que la mayor afectación por carga mental está en el grupo de edad de: 55 59 años con un puntaje de 1250, luego los de 40 a 44 años con un valor de 1020 y los de 50 a 54 años con un valor de 1010, luego siguen los demás grupos con valores menores de 100. El valor de fatiga mental determina valores del100% de afectación al grupo de 35 a 39 años de edad y 50 a 54 años un 87,5 % de afectación al grupo de 40 a 44 años de edad, los demás grupos presentan valores menos del 75% de afectación por molestias de fatiga mental. Todos los grupos presentan molestias de fatiga simple y crónica. Conclusión: Los resultados identifican como grupo más afectado por carga y fatiga mental a docentes que superan los 39 años de edad por actividades de teletrabajo. Por otro lado la afectación por fatiga mental simple y crónica es proporcional y afecta significativamente a todos los grupos

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Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China

Cited by 34 publications

References 58 publications

Assessment of the COVID-19 Lockdown Effects on Spectral Aerosol Scattering and Absorption Properties in Athens, Greece

Assessment of the COVID-19 Lockdown Effects on Spectral Aerosol Scattering and Absorption Properties in Athens, Greece

The global impacts of COVID-19 lockdowns on urban air pollution

Evaluación de la carga y fatiga mental en docentes por teletrabajo a causa del COVID-19

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