Hemba, E. C., E. A. Trisma, and T. J. Ikyumbur. “Mass Concentration and Size-Distribution of Atmospheric Particulate Matter in Plateau State, Nigeria”. International Journal of Environment and Climate Change 9, no. 12 (November 9, 2019): 701-707. Accessed January 27, 2020. http://journalijecc.com/index.php/IJECC/article/view/30151.