Anonymous asked: effect of car exhaust on plants
Chemicals such as sulfur dioxide, ozone, fluorides and peroxyacyl nitrate damage the leaves of plants. If enough leaves are damaged, the entire plant will die. Sulfur dioxide, a by-product of burning fossil fuels such as oil, coal and gasoline, causes changes in the colors of leaf tissue, which may turn white, brown or yellow.
Some sulfur dioxide converts to sulfuric acid, which eats holes in the leaves. Ozone damage on leaves appears as mottled spots, which may be yellow, black or brown. If the damage by ozone is severe enough, the plant will drop its leaves altogether. Fluoride damages the edges of plants and causes them to turn brown or black. Peroxyacyl nitrate causes a condition known as silver leaf, in which the underside of the leaves turn silvery white or bronze.