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

被引：3

作者：

Atiaga, Oliva ^{[1
,2
]}

Guerrero, Fernanda ^{[1
]}

Paez, Fernando ^{[1
]}

Castro, Rafael ^{[3
]}

Collahuazo, Edison ^{[3
]}

Nunes, Luis Miguel ^{[4
,5
]}

Grijalva, Marcelo ^{[6
]}

Grijalva, Ivan ^{[7
]}

Otero, Xose Luis ^{[2
,8
]}

机构：

[1] Univ Fuerzas Armadas ESPE, Dept Ciencias Tierra & Construcc, POB 171-5-231B,Av Gen Ruminahui S-N, Sangolqui, Ecuador

[2] Univ Santiago Compostela, Dept Edafoloxia Quim Agr, Fac Biol, CRETUS, Campus Sur, Santiago De Compostela 15782, Spain

[3] Geospace Solut, Av Manuel Cordova Galarza Km 4-5,POB 170177, Quito, Ecuador

[4] Univ Algarve, Fac Ciencias & Tecnol, Campus Gambelas, Faro, Portugal

[5] Univ Lisbon, CERIS, Inst Super Tecn, Av Rovisco Pais 1, P-1049001 Lisbon, Portugal

[6] Univ Fuerzas Armadas ESPE, Dept Ciencias Vida, Av Gen Ruminahui S-N,POB 171-5-231B, Sangolqui, Ecuador

[7] Ave Amazonas N22-62 & Ramirez Davalos,POB 170526, Quito, Ecuador

[8] Univ Santiago Compostela, REBUSC Network Biol Field Stn, Marine Biol Stn Grana & Ferrol, Santiago De Compostela 15782, Spain

来源：

HELIYON | 2023年 / 9卷 / 06期

关键词：

Air quality; Covid-19; Nitrogen dioxide; Sulfur dioxide; Ozone; TROPOMI; IMPACT;

D O I：

10.1016/j.heliyon.2023.e17033

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：10

共 38 条

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