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We need to pay more attention to toxic emissions from tires as vehicles roll down the road, researchers and regulators say.

'It’s a thousand-piece jigsaw.'

Tires emit huge volumes of particles and chemicals as they roll along the highway, and researchers are only beginning to understand the threat. One byproduct of tire use, 6PPD-q, is in regulators’ crosshairs after it was found to be killing fish.

For decades, concerns about automobile pollution have focused on what comes out of the tailpipe. Now, researchers and regulators say, we need to pay more attention to toxic emissions from tires as vehicles roll down the road.

Tires emit huge volumes of particles and chemicals as they roll along the highway, and researchers are only beginning to understand the threat. One byproduct of tire use, 6PPD-q, is in regulators' crosshairs after it was found to be killing fish.