Heavy industry factory: Chose mainly fast-growing arbors such as paulownia, chinar, pine and cypress, mango, areca, camphor, banyan, etc. This sort of factories should firstly plant trees nearby the administration quarter, offices and buildings. The trees can be windproof and shady around the car-passing roads and plants. Near the plants where the noise is high, shrubs and arbors that have low-crown, low branches and dense leaves can be planted, forming sparse tree mass or several lines of tree belts to weaken the noise intensity.
Chemical plants: Chose the tree species that are pollution-resistant and toxin-adsorbing, such as the SO2-resistant yellow oleander, Chinese banyan, Indian ficus, horsetail beefwood, jackfruit and erythrina; Hydrogen Fluoride-resistant clove, privet, spindle tree, dragon cypress and camphor; chlorine-resistant Chinese banyan, Indian ficus, horsetail beefwood, candlenut and Java Bishopwood. At the same time, some ground cover plants that can absorb the harmful substances should be planted in large amount to reduce the damage to human body.
Light industry factories: Except tall arbors such as mango and white michelia, etc., some shrubs can be planted. Some palms can be planted, such as Chinese fanpalm, fishtail palm, Cuban royal palm, etc., to make the factory beautiful, green and aromatic.
Electronic instrument factories: Chose the tree species that have the function of sanitary protection. Evergreen trees, flowers and shrubs can be planted too, such as cedar, dragon cypress, jackfruit, bamboo, palms, etc. Arbors and shrubs can be planted in the plants and laboratories of precise instrument factories, where should be highly dustproof. Climbers can be used on the building walls, such as Pyrostegia ignea, morning glory, honeysuckle, etc. Bougainvillea can be planted on the bounding walls. If possible, some gardens can be built with lawns, parterres and fountain pools. This will reduce the dusts and refine the air.