To combat the problems associated with high levels of ground-level ozone, the Clean Air Act of 1970 called on all government agencies to take measures to reduce ground-level ozone in our air to 120 parts per billion (ppb). Detection of ozone levels is accomplished in a number of ways. This article describes a technique that allows students to evaluate their school’s environment and air quality using an Eco Badge. The Eco Badge comes in a kit that has 150 test cards (strips) and five Eco Badges, plus background information on ozone and its effects (see Resources). Throughout the activity, students use scientific process skills such as: data collection, analysis, and interpretation; measuring; experimenting; and observing.