1  https://energyandcleanair.org/ retrieved on March, 26 2020
2  https://www.earthobservatory.nasa.gov/images/146362/airborne-nitrogen-dioxide-plummets-over-china retrieved on March, 20 2020
3  https://www.esa.int/ESA_Multimedia/Videos/2020/03/Coronavirus_nitrogen_dioxide_emissions_drop_over_Italy retrieved on March, 24 2020
4  https://www.arpalombardia.it/Pages/Aria/Inquinanti/PM10-PM2,5.aspx?firstlevel=Inquinanti retrieved on March, 16 2020
5  https://www.flightradar24.com/ retrieved on March, 26 2020
6  https://www.iea.org/topics/oil-market-report retrieved on March, 25 2020
7  https://www.oecd.org/economy/global-economy-faces-gravest-threat-since-the-crisis-as-coronavirus-spreads.htm retrieved on March, 25 2020