WASET
    Turki M. Habeebullah and  Said Munir and  Karl Ropkins and  Essam A. Morsy and  Atef M. F. Mohammed and  Abdulaziz R. Seroji,  A Comparison of Air Quality in Arid and Temperate Climatic Conditions – A Case Study of Leeds and Makkah.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 102(6). 750 - 758
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10002002.