Car tyres produce vastly more particle pollution than exhausts, tests show

Dupes: https://news.ycombinator.com/item?id=31622163 https://news.ycombinator.com/item?id=31617438 https://news.ycombinator.com/item?id=31606996

There may be others.

I suspect this spamming is political. Propaganda got people to ignore the Mueller report. The Big Lie is making people distrust elections even in the face of evidence. Some auto industry cartel wants to get rid of air pollution and efficiency requirements. Hence this spam.