Open Access Open Access  Restricted Access Subscription or Fee Access

Correlation analysis of the variability of NO2 and PM tropospheric concentrations within the Greater Salento (Italy) before, during and after the COVID-19 lockdown

M. Ruberti, L. Romano


The period of lockdown, which occurred in many nations as a result of the COVID-19 pandemic, represented, for scholars, who deal with the complex dynamics connected to emissions and concentrations of atmospheric pollutants, an excellent opportunity to deepen their studies. However, to date, scientific papers, relating to correlation studies between the spatial and temporal variations of the main pollutants present in our cities (among all, NO2 and particulates), during the long and atypical period of the almost total block of vehicular traffic and many productive activities during pandemic peak, are still very few. This analysis focuses on the Greater Salento region (Italy) and aims to monitor the changes, and the related interrelationships, of the tropospheric concentrations of NO2, PM2.5 and PM10, elaborating the overall data of average daily concentrations of these pollutants as recorded by the ARPA-Puglia ground-based monitoring stations. Nitrogen dioxides and PM emissions are notoriously related to vehicular traffic exhausts and, in general, to fossil fuel combustion processes. This analyzed Italian territory is very unusual because there are two provinces with large industrial settlements, Taranto, with the steel area of ex-ILVA, and Brindisi, with petrochemical and thermoelectric power plants, which enclose a territory, the province of Lecce, free of any industrial plants of such sizes and impacts. From the results of this study, in addition to confirming the obvious and overall decrease of NO2 concentrations during and after the lockdown period, interesting and distinctive local correlations of the concentrations variability of these pollutants have also emerged. In fact, the conclusions of this paper are so significant as to allow broader considerations regarding other similar international areas, regarding, i.e., the ineffectiveness of government containment local measures concerning the tropospheric pollution of our cities.


nitrogen dioxide (NO2), particulate matter (PM), PM2.5, PM10, vehicles, heating, background pollution.

Full Text:


Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.