WASET
    Turki M. Habeebullah and  Atef M. F. Mohammed and  Essam A. Morsy,  Risk Assessment of Particulate Matter (PM10) in Makkah, Saudi Arabia.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 104(8). 947 - 954
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10001998.