Yes its chemical leaching. "The researchers determined that the chemical is formed when a preservative known as 6PPD reacts with ozone. 6PPD is designed to ext

Yes its chemical leaching. "The researchers determined that the chemical is formed when a preservative known as 6PPD reacts with ozone. 6PPD is designed to extend the lifespan of tires by reacting with ozone in the surrounding air before it has a chance to interact with the rubber and weaken it, Kolodziej said." https://www.popsci.com/story/environment/coho-salmon-toxic-chemical-car-tires/ https://www.popsci.com/story/environment/coho-salmon-toxic-c...