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At the top of the list of worries is a chemical called 6PPD, which is added to rubber tires to help them last longer. When tires wear on pavement, 6PPD is released. It reacts with ozone to become a different chemical, 6PPD-q, which can be extremely toxic — so much so that it has been linked to repeated fish kills in Washington state. (Dreamstime/TNS)California has begun taking steps to regulate the chemical, last year classifying tires containing 6PPD as a “priority product,” which requires manufacturers to search for and test substitutes.
Originally published at Tribune News Service