A data-driven approach to forecasting ground-level ozone concentration

Marvin, Dario and Nespoli, Lorenzo and Strepparava, Davide and Medici, Vasco (2021) A data-driven approach to forecasting ground-level ozone concentration. International Journal of Forecasting. (In Press)

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Abstract

The ability to forecast the concentration of air pollutants in an urban region is crucial for decision-makers wishing to reduce the impact of pollution on public health through active measures (e.g. temporary traffic closures). In this study, we present a machine learning approach applied to forecasts of the day-ahead maximum value of ozone concentration for several geographical locations in southern Switzerland. Due to the low density of measurement stations and to the complex orography of the use-case terrain, we adopted feature selection methods instead of explicitly restricting relevant features to a neighborhood of the prediction sites, as common in spatio-temporal forecasting methods. We then used Shapley values to assess the explainability of the learned models in terms of feature importance and feature interactions in relation to ozone predictions. Our analysis suggests that the trained models effectively learned explanatory cross-dependencies among atmospheric variables. Finally, we show how weighting observations helps to increase the accuracy of the forecasts for specific ranges of ozone�s daily peak values.

Item Type:	Scientific journal article, Newspaper article or Magazine article
Uncontrolled Keywords:	Shapley values, Genetic algorithms, Environmental forecasting, Evaluating forecasts, Multivariate time series
Subjects:	Physical sciences > Science of aquatic & terrestrial environments > Environmental sciences > Pollution control
Department/unit:	Dipartimento ambiente costruzioni e design > Istituto sostenibilità applicata all'ambiente costruito
Depositing User:	Vasco Medici
Date Deposited:	09 Dec 2021 12:14
Last Modified:	09 Dec 2021 12:23
URI:	http://repository.supsi.ch/id/eprint/13083

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