Mahogani trees known as a material for making all kinds of furniture, and the trees is good for eliminating air polutan too. Based on research in the laboratory, mahogany trees (Swietenia mahagoni) can reduce air pollution for about 47% until 69%. Mahogany trees are planted in the urban forest or along the street as air filters and water catchment area. The leaves absorb pollutants. The leaves release oxygen (O2), which makes air becoming fresh. When rain comes, soil and tree roots will bind the water.