Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic

Detalhes bibliográficos
Autor(a) principal: Atiaga, Oliva
Data de Publicação: 2023
Outros Autores: Guerrero, Fernanda, Páez, Fernando, Castro, Rafael, Collahuazo, Edison, Nunes, Luís, Grijalva, Marcelo, Grijalva, Iván, Otero, Xosé Luis
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/20030
Resumo: This study analyzes the effect of lockdown due to COVID-19 on the spatiotemporal variability of ozone (O3), sulfur dioxide (SO2), and nitrogen dioxide (NO2) concentrations in different provinces of continental Ecuador using satellite information from Sentinel - 5P. The statistical analysis includes data from 2018 to March 2021 and was performed based on three periods defined a priori: before, during, and after lockdown due to COVID-19, focusing on the provinces with the highest concentrations of the studied gases (hotspots). The results showed a significant decrease in NO2 concentrations during the COVID-19 lockdown period in all the study areas: the Metropolitan District of Quito (DMQ) and the provinces of Guayas and Santo Domingo de los Ts & PRIME;achilas. In the period after lockdown, NO2 concentrations increased by over 20% when compared to the pre-lockdown period, which may be attributable to a shift towards private transportation due to health concerns. On the other hand, SO2 concentrations during the lockdown period showed irregular, non-significant variations; however, increases were observed in the provinces of Chimborazo, Guayas, Santa Elena, and Morona Santiago, which could be partly attributed to the eruptive activity of the Sangay volcano during 2019-2020. Conversely, O3 concentrations increased by 2-3% in the study areas; this anomalous behavior could be attributed to decreased levels of NOx, which react with ozone, reducing its concentration. Finally, satellite data validation using the corresponding data from monitoring stations in the DMQ showed correlation values of 0.9 for O3 data and 0.7 for NO2 data, while no significant correlation was found for SO2.
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spelling Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemicAir qualityCovid-19Nitrogen dioxideSulfur dioxideOzoneThis study analyzes the effect of lockdown due to COVID-19 on the spatiotemporal variability of ozone (O3), sulfur dioxide (SO2), and nitrogen dioxide (NO2) concentrations in different provinces of continental Ecuador using satellite information from Sentinel - 5P. The statistical analysis includes data from 2018 to March 2021 and was performed based on three periods defined a priori: before, during, and after lockdown due to COVID-19, focusing on the provinces with the highest concentrations of the studied gases (hotspots). The results showed a significant decrease in NO2 concentrations during the COVID-19 lockdown period in all the study areas: the Metropolitan District of Quito (DMQ) and the provinces of Guayas and Santo Domingo de los Ts & PRIME;achilas. In the period after lockdown, NO2 concentrations increased by over 20% when compared to the pre-lockdown period, which may be attributable to a shift towards private transportation due to health concerns. On the other hand, SO2 concentrations during the lockdown period showed irregular, non-significant variations; however, increases were observed in the provinces of Chimborazo, Guayas, Santa Elena, and Morona Santiago, which could be partly attributed to the eruptive activity of the Sangay volcano during 2019-2020. Conversely, O3 concentrations increased by 2-3% in the study areas; this anomalous behavior could be attributed to decreased levels of NOx, which react with ozone, reducing its concentration. Finally, satellite data validation using the corresponding data from monitoring stations in the DMQ showed correlation values of 0.9 for O3 data and 0.7 for NO2 data, while no significant correlation was found for SO2.ElsevierSapientiaAtiaga, OlivaGuerrero, FernandaPáez, FernandoCastro, RafaelCollahuazo, EdisonNunes, LuísGrijalva, MarceloGrijalva, IvánOtero, Xosé Luis2023-10-02T14:48:40Z20232023-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/20030eng10.1016/j.heliyon.2023.e170332405-8440info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-10-04T02:00:27Zoai:sapientia.ualg.pt:10400.1/20030Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:33:16.240012Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
title Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
spellingShingle Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
Atiaga, Oliva
Air quality
Covid-19
Nitrogen dioxide
Sulfur dioxide
Ozone
title_short Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
title_full Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
title_fullStr Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
title_full_unstemmed Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
title_sort Assessment of variations in air quality in cities of Ecuador in relation to the lockdown due to the COVID-19 pandemic
author Atiaga, Oliva
author_facet Atiaga, Oliva
Guerrero, Fernanda
Páez, Fernando
Castro, Rafael
Collahuazo, Edison
Nunes, Luís
Grijalva, Marcelo
Grijalva, Iván
Otero, Xosé Luis
author_role author
author2 Guerrero, Fernanda
Páez, Fernando
Castro, Rafael
Collahuazo, Edison
Nunes, Luís
Grijalva, Marcelo
Grijalva, Iván
Otero, Xosé Luis
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Sapientia
dc.contributor.author.fl_str_mv Atiaga, Oliva
Guerrero, Fernanda
Páez, Fernando
Castro, Rafael
Collahuazo, Edison
Nunes, Luís
Grijalva, Marcelo
Grijalva, Iván
Otero, Xosé Luis
dc.subject.por.fl_str_mv Air quality
Covid-19
Nitrogen dioxide
Sulfur dioxide
Ozone
topic Air quality
Covid-19
Nitrogen dioxide
Sulfur dioxide
Ozone
description This study analyzes the effect of lockdown due to COVID-19 on the spatiotemporal variability of ozone (O3), sulfur dioxide (SO2), and nitrogen dioxide (NO2) concentrations in different provinces of continental Ecuador using satellite information from Sentinel - 5P. The statistical analysis includes data from 2018 to March 2021 and was performed based on three periods defined a priori: before, during, and after lockdown due to COVID-19, focusing on the provinces with the highest concentrations of the studied gases (hotspots). The results showed a significant decrease in NO2 concentrations during the COVID-19 lockdown period in all the study areas: the Metropolitan District of Quito (DMQ) and the provinces of Guayas and Santo Domingo de los Ts & PRIME;achilas. In the period after lockdown, NO2 concentrations increased by over 20% when compared to the pre-lockdown period, which may be attributable to a shift towards private transportation due to health concerns. On the other hand, SO2 concentrations during the lockdown period showed irregular, non-significant variations; however, increases were observed in the provinces of Chimborazo, Guayas, Santa Elena, and Morona Santiago, which could be partly attributed to the eruptive activity of the Sangay volcano during 2019-2020. Conversely, O3 concentrations increased by 2-3% in the study areas; this anomalous behavior could be attributed to decreased levels of NOx, which react with ozone, reducing its concentration. Finally, satellite data validation using the corresponding data from monitoring stations in the DMQ showed correlation values of 0.9 for O3 data and 0.7 for NO2 data, while no significant correlation was found for SO2.
publishDate 2023
dc.date.none.fl_str_mv 2023-10-02T14:48:40Z
2023
2023-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.1/20030
url http://hdl.handle.net/10400.1/20030
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1016/j.heliyon.2023.e17033
2405-8440
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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