^ أ ب ت ث ج ح "Health & Environmental Effects of Air Pollution",,11-5-2019، Retrieved 11-5-2019. ^ أ ب Iuliana Florentina Gheorghe, Barbu Ion (26/9/2011), "The Effects of Air Pollutants on Vegetation and the Role of Vegetation in Reducing Atmospheric Pollution", intech open, Retrieved 26/9/2021. Edited.