"In this article, we will examine what ozone is, how it is produced, what health hazards it poses and what you can do to reduce ozone pollution. Ozone is a molecule of three oxygen atoms bound together (O3). It is unstable and highly reactive. Ozone is used as a bleach, a deodorizing agent, and a sterilization agent for air and drinking water. At low concentrations, it is toxic." (Quoted from article)