There was a piece on Google news the other day that I meant to post on, but never got around to, about an extensive study that had been carried out in three major UK cities.
It surprisingly found that there was more pollution particle-wise from tyres than from diesel engines, and that diesel vehicles actually cleaned the air they were driven through - some type of test carried out at the air-intake and exhaust. I'll see if I can re-find it and post the link.
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