6PPD is the primary anti-degradant in tires and has been in use since the 1960s. 6PPD-quinone (6PPD-q) is one of the products formed by the reaction of 6PPD and ozone. 6PPD-q was identified as a chemical fatal to coho salmon in 2020. Since that time, it has been documented as acutely toxic to multiple trout species found throughout the United States. 6PPD and 6PPD-q have been found in waterways, aquatic organisms, soil, air, and humans.
This ITRC guidance document provides information about 6PPD and 6PPD-q that can help inform future policies and regulations regarding these chemicals. It includes:
- An introduction to 6PPD and 6PPD-q
- Current knowledge of effects, toxicity, and physical/chemical properties of 6PPD and 6PPD-q
- The occurrence, fate, and transport of 6PPD and 6PPD-q in the environment
- An overview of measuring, mapping, and modeling techniques for these chemicals
- Discussion of mitigation measures, solutions, policies, regulations, and laws
- An overview of information gaps and research needs
The 6PPD Team also published a focus sheet, What We Know: 6PPD and 6PPD-quinone, which provides a first look and overview of 6PPD and 6PPD-q.
Topic(s): 6PPD, Contaminants of Emerging Concern, Stormwater, Tire Degradant
