Background:To study,estimate and discuss the variations of the aerosol optical depth(AOD),black carbon,sulfate and organic matter,in the atmosphere in Blida Cit
Background:The coronavirus disease 2019(COVID-19)became a global pandemic within several months after it was first reported at the end of December,2019.Countrie
Background:Global spread and impact of the coronavirus disease 2019(COVID-19)pandemic are determined to a large extent,by resistance to the pandemic and public