A model for simultaneous evaluation of NO2, O-3, and PM10, pollution in urban and rural areas: handling incomplete data sets with multivariate curve resolution analysis - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2022

A model for simultaneous evaluation of NO2, O-3, and PM10, pollution in urban and rural areas: handling incomplete data sets with multivariate curve resolution analysis

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A powerful methodology, based on the multivariate curve resolution alternating least squares (MCR-ALS) method with quadrilinearity constraints, is proposed to handle complex and incomplete four-way atmospheric data sets, providing concise results that are easy to interpret. Changes in air quality by nitrogen dioxide (NO2), ozone (O-3), and particulate matter (PM10) in eight sampling stations located in the Barcelona metropolitan area and other parts of Catalonia during the COVID-19 lockdown period (2020) with respect to previous years (2018 and 2019), are investigated using such methodology. The MCR-ALS simultaneous analysis of the three contaminants among the eight stations and for the 3 years allows the evaluation of potential correlations among the pollutants, even when having missing data blocks. Correlated profiles are shown by NO2 and PM10 due to similar pollution sources (traffic and industry), evidencing a decrease in 2019 and 2020 due to traffic restriction policies and the COVID-19 lockdown period, especially noticeable in the most transited urban areas (i.e., Vall d'Hebron, Granollers and Gracia). The O-3 evidences an opposed interannual trend, showing higher amounts in 2019 and 2020 with respect to 2018 due to the decreased titration effect, more significant in rural areas (Begur) and in the control site (Obserbatori Fabra).
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hal-03763561 , version 1 (29-08-2022)

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Eva Gorrochategui, Isabel Hernández, Romà Tauler. A model for simultaneous evaluation of NO2, O-3, and PM10, pollution in urban and rural areas: handling incomplete data sets with multivariate curve resolution analysis. Atmospheric Chemistry and Physics, 2022, 22 (13), pp.9111-9127. ⟨10.5194/acp-22-9111-2022⟩. ⟨hal-03763561⟩
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