Air pollution is a big deal
patrickcollison.com
patrickcollison.com
An euphemism for brain damage is "cognitive defects" but it is of course the same thing. Now imagine someone caused brain damage to your children (for example by causing a head trauma), would you be ok with that? Probably not. Not even a very small brain injury would be ok, but millions of cars doing the exact same thing, no problem!
The FAA says “more than 167,000 piston-engine aircraft operating in the United States rely on aviation gasoline (avgas)“: https://www.faa.gov/about/initiatives/avgas/
I did a bit of reading and it looks like the best thing to do is to run an indoor air filter and have indoor plants that are effective at absorbing CO2 with indoor lighting[1] (not all are!).
Unfortunately recent research indicates plants aren't great at removing general particle pollution though.
[1] https://www.matec-conferences.org/articles/matecconf/pdf/201...