If this were to happen, new businesses may not want to come to the region, and existing businesses would face tougher requirements for expansion. When we talk about smog, we are really referring to ground-level ozone, which is the main component in smog. Good ozone is found naturally in the earth's stratosphere. It protects the earth from the sun's harmful ultraviolet light. Ozone in this layer is made and destroyed naturally all the time, but many man-made chemicals are destroying it too.
Bad ozone is found closer to the earth's surface in a layer called the troposphere.
This kind of ozone is made up of a number of noxious gases that combine and change in the presence of sunlight. We see ozone as the ugly brown ring on the horizon, but the real problems are for human health. High levels of ozone pollution cause discomfort for people with asthma or other lung ailments. Ozone may be damaging to lung tissue even in healthy people. It makes our eyes itch, burn and water.