What makes smog?
Usually the burning of some material creates smog which is defined as smoky fog. In the In the times before man nature could create fog from volcanic gasses or naturally created forest fires. Man has recently stressed the environment by increasing the load to the ecosystem by first burning large quantities of coal during the Industrial Revolution in the late 1800s. Dickens described the smog that hung over London. More recently man has stressed the environment by making iron and tires in the automobile industry in large quantities. In these processes more than just Carbon oxygen compounds were made (which are present in the burning of wood or coal), such as sulfur compounds. Typical smog caused during inversion layers in places such as Mexico City or Los Angeles are caused automobile exhaust (burnt gasoline) which get trapped in a valley. The carbon dioxide part of the smog can be reabsorbed into the ecosystem by plants. However, this process takes time and if we destroy large amounts
