Car exhaust filters fail to clean up ‘ultrafine’ air pollution

Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by Neil44 on Sunday April 09, 2023 @07:41AM (#35501791)

It’s hard to really quantify how big of an issue this is in my head, I mean a set of tyres will do 20,000+ miles and only loose a small percentage of their mass while doing so. How much damage is really being done? How much scope for improvement is there?

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Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by marginalia_nu on Sunday April 09, 2023 @07:54AM (#35501872)

Depends on the sort of tires.

For examples, studded snow tires can tear up the road surface quite significantly, tend to kick up a lot of sharp fine dust. It's such a big problem they're often banned parts of the year in some regions where they're typically used.

Here's some science: https://www.ivl.se/download/18.1ee76657178f8586dfc89b/161951...

It seems to largely suggest that GP is correct (see the figure in 5.3.8 for example), with the caveat that this is mainly a problem in colder regions of the world.

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Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by chongli on Sunday April 09, 2023 @08:19AM (#35502036)

The road itself gets torn to pieces as well. Furthermore, tire and road wear scales with the 4th power of the vehicle mass. Heavy trucks and buses cause far more damage than cars. But all that damage leaves dust all over the road which cars will scatter all over the place.

Lastly, as pointed out above, EVs weigh a lot more, so the damage they cause will go up a lot, thanks to that 4th power scaling.

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