Rahma Al Maawali and  Hameed Sulaiman,  Trees for Air Pollution Tolerance to Develop Green Belts as an Ecological Mitigation.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 116 - 119
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/10006238.