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A comment on Car exhaust filters fail to clean up ‘ultrafine’ air pollution. Parent comment

Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by jeffbee on Sunday April 09, 2023 @11:55AM (#35503909)
Why do you believe this? It doesn't make any physical sense. Tire and resuspended road dust are in the 1-10µm range and they can fly as high and as far and for as long as a same-sized particle from exhaust.
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Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by ip26 on Sunday April 09, 2023 @12:23PM (#35504146)
1-10µm is a size, not a mass or chemical property. Maybe tire PM2.5 stays aloft the same amount of time as smoke PM2.5, but I don't see why that is a given.

The press on the subject also annoyingly sidesteps a direct comparison. For example, you can read that tires product 2000x the particle emissions as tailpipes, and lots of ultrafines. Notice that statement does not tell you anything about the relative difference in ultrafine production.

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Re:Car exhaust filters fail to clean up ‘ultrafine’ air poll... by jeffbee on Sunday April 09, 2023 @12:38PM (#35504282)
The media coverage on this is terrible but that is because the media is staffed full of people who did not study hard sciences. There's nothing wrong with the research on this topic and there is tons of it.
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