This ITRC document provides information about 6PPD and 6PPD-quinone (6PPD-q) that can help inform future policies and regulations regarding these chemicals. The guide provides:
- 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
6PPD-q is a contaminant of emerging concern and is a transformation product of 6PPD, an antiozonant used in tires. Currently, 6PPD is used in all tires and can contaminate stormwater and surface water anywhere tires are used.
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.
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