Certified Hazardous Materials Manager (CHMM) Practice Exam 2026 - Free CHMM Practice Questions and Study Guide

TNT, or trinitrotoluene, is a well-known explosive compound that has been widely used in military applications and construction. Under the Toxic Substances Control Act (TSCA), chemicals are evaluated based on their potential risks to human health and the environment. While TNT poses concerns related to its explosive properties and potential environmental impact when improperly handled, it has not been classified as posing an "unreasonable risk" under TSCA.

The other substances listed have been classified as posing unreasonable risks due to their severe health effects or environmental impact. TCDD, for example, is a known carcinogen and a highly toxic dioxin that can accumulate in the food chain. CFCs (chlorofluorocarbons) have been implicated in ozone depletion and have adverse effects on atmospheric conditions. PCBs (polychlorinated biphenyls) are associated with severe ecological and health issues, including cancer.

Thus, TNT is considered less problematic in the context of TSCA compared to these other chemicals, which have demonstrated significant risks that warrant closer regulation and control.