Ozone measurements monitoring using data-based approach

Fouzi Harrou (1) , Farid Kadri (2) , Sofiane Khadraoui (3) , Ying Sun (1)

1 KAUST - King Abdullah University of Science and Technology [Saudi Arabia]
2 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
3 American University of Sharjah

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The complexity of ozone (O 3 ) formation mechanisms in the troposphere makes the fast and accurate modeling of ozone very challenging. In the absence of a process model, principal component analysis (PCA) has been extensively used as a data-based monitoring technique for highly correlated process variables; however, conventional PCA-based detection indices often fail to detect small or moderate anomalies. In this work, we propose an innovative method for detecting small anomalies in highly correlated multivariate data. The developed method combines the multivariate exponentially weighted moving average (MEWMA) monitoring scheme with PCA modeling in order to enhance anomaly detection performance. Such a choice is mainly motivated by the greater ability of the MEWMA monitoring scheme to detect small changes in the process mean. The proposed PCA-based MEWMA monitoring scheme is successfully applied to ozone measurements data collected from Upper Normandy region, France, via the network of air quality monitoring stations. The detection results of the proposed method are compared to that declared by Air Normand air monitoring association.

Mots clés: Anomaly detection - Data-driven strategy - MEWMA statistic - MSPCOzone pollution - Principal components analysis

Domaines: Sciences de l'ingénieur [physics]

Fouzi Harrou, Farid Kadri, Sofiane Khadraoui, Ying Sun. Ozone measurements monitoring using data-based approach. Process Safety and Environmental Protection, 2016, 100, pp.220-231. ⟨10.1016/j.psep.2016.01.015⟩. ⟨hal-02292084⟩