Beelen, R., O. Raaschou-Nielsen, M. Stafoggia, Z.J. Andersen, G. Weinmayr, and B. Hoffmann. “Air Pollution and Human Health: Long-Term Exposure to Fine Particulate Air Pollution Associated With Natural-Cause Mortality”. Clean Air Journal 24, no. 1 (June 3, 2014): 6. Accessed April 20, 2024. https://cleanairjournal.org.za/article/view/7056.