Extensive site provides information on health effects of ground-level ozone-smog. Explains the air quality index and provides links to area ozone maps.

This diagram shows a 3D computer generated image of the triatomic molecule known as ozone. Ozone is an allotrope that contains three oxygen atoms. The ozone layer found in the upper atmosphere helps protect the Earth against potentially...

Spanish content; this is an informative article on the ozone layer and how it affects life in Argentina.

This is a great set of lesson plans through which students explore air pollution and its causes and become aware of air pollution trends and how air pollution affects health. Many questions are examined during the course of study: "What...

Earth Day is a worldwide celebration held annually on April 22nd. The purposes of Earth Day, the history of and the various activities held around the world are described. Activities and projects that can be done daily or year round are...

Take an interactive quiz over ecological problems affecting the environment. After completing the quiz, check your score, and then revisit any incorrect question for further review.

Site provides information on the Earth's atmosphere as well as offers additional information about Earth.