Which of the following is NOT included in the Toxic Substances Control Act’s list of chemicals?

The Toxic Substances Control Act (TSCA) is a significant piece of legislation that regulates the introduction of new chemicals and the manufacturing of existing chemicals in the United States. While the act encompasses a broad range of substances, it primarily focuses on industrial chemicals and other substances identified as potentially harmful to human health and the environment.

PCBs (Polychlorinated Biphenyls) and formaldehyde are well-known chemicals that are regulated under TSCA due to their recognized health risks. PCBs were widely used in electrical equipment and other applications before being banned, while formaldehyde is commonly found in building materials and household products and has been classified as a probable human carcinogen.

Lead paint, especially in homes built before 1978, is also addressed by the TSCA because of the serious health risks associated with lead exposure, particularly in children.

Ozone, on the other hand, is a naturally occurring gas that is present in the Earth’s atmosphere. It is not a man-made chemical that is manufactured or processed in a way that TSCA covers. Rather, it is regulated under the Clean Air Act due to its role as a pollutant at ground level while still providing beneficial effects in the upper atmosphere. Therefore, ozone is not included