6PPD-quinone (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, soils, air, and humans.
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