Interesting. This article you linked states that tires emit not only more particulate emissions than tailpipes during driving, but also more VOC emissions!

> Another area of research centers on the impacts of aromatic hydrocarbons — including benzene and naphthalene — off-gassed by synthetic rubber or emitted when discarded tires are burned in incinerators for energy recovery. Even at low concentrations, these compounds are toxic to humans. They also react with sunlight to form ozone, or ground-level smog, which causes respiratory harm. “We have shown that the amount of off-gassing volatile organic compounds is 100 times greater than that coming out of a modern tailpipe,” said Molden. “This is from the tire just sitting there.”