Time series analysis of the air pollution around Ploiesti oil refining complex, one of the most polluted regions in Romania.

An increasing trend was found in case of Cd and Ni between 2012 and 2016 (Fig. 2 ).

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Compared to the first reference year (2009), except ethylbenzene, o-xylene and temperature, in the last years a decreasing trend can be observed in the annual mean concentrations.

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