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• W4254388624 abstract "Abstract In this study, changes in air quality by NO 2 , O 3 and PM 10 in Barcelona metropolitan area and other parts of Catalonia during the COVID-19 lockdown with respect to pre-lockdown and to previous years (2018 and 2019) were evaluated. Selected air monitoring stations included 3 urban (Gràcia, Vall d’Hebron and Granollers), 1 control site (Fabra Observatory), 1 semi-urban (Manlleu), and 3 rural (Begur, Bellver de Cerdanya, and Juneda). NO 2 lockdown levels showed a diminution, which in relative terms was maximum in two rural stations (Bellver de Cerdanya, -63% and Begur, -61%), presumably due to lower emissions from the ceasing hotel and ski resort activities during eastern holidays. In absolute terms and from an epidemiologic perspective, decrease in NO 2 , also reinforced by the high amount of rainfall registered in April 2020, was more relevant in the urban stations around Barcelona. O 3 levels increased in the transited urban stations (Gràcia, +42%, and Granollers, +64%) due to the lower titration effect by NO x . PM 10 lockdown levels decreased, mostly in Gràcia, Vall d’Hebron and Granollers (-35, -39% and -39%, respectively) due to traffic depletion (-90% in Barcelona's transport). Correlation among mobility index in Barcelona (-100% in retail & recreation) and contamination was positive for NO 2 and PM 10 and negative for O 3 ( P <0.001). Satellite images evidenced two hotspots of NO 2 in Spain (Madrid and Barcelona) in April 2018 and 2019 that disappeared in 2020. Overall, the benefits of lockdown on air quality in Catalonia were evidenced with NO 2 , O 3 and PM 10 levels below WHOAQG values in most of stations opposed to the excess registered in previous years." @default.
• W4254388624 created "2022-05-12" @default.
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• W4254388624 date "2021-08-25" @default.
• W4254388624 modified "2023-09-27" @default.
• W4254388624 title "Temporal Air Quality (NO2, O3 and PM10) Changes in Urban and Rural Stations in Catalonia during COVID-19 Lockdown: An Association with Human Mobility and Satellite Data" @default.
• W4254388624 doi "https://doi.org/10.21203/rs.3.rs-311721/v2" @default.
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