This section provides an overview of ozone and why it is considered to be 'bad' when found in the troposphere, and 'good' when found in the stratosphere.
Ozone has the same chemical structure whether it is found in the stratosphere or troposphere.
Ozone is unstable and will readily combine with other atoms. Ozone is also found in the troposphere, where it can damage living tissue and human-produced objects. It is generated both from certain types of pollution and natural sources. This section includes four classroom activities. Introduction The Ozone Hole.