It is not as simple as the amount of dust/dirt in the air.
Studies have found those living close to a highway or busy street have an increased chance of dying. The type of particulate becomes heavy more deadly.
I read before that tires actually degrade and that contributes to pollution.
I mentioned room air filters, because that seems like it would be a wise investment for people that live close to highways, or people that spend a lot of time in indoors like programmers.
So that maybe someone with a room air filter can comment on which ones are worth getting.
I saw and posted a link to a paper that discussed where automotive particulates come from, with estimates for each. I think brakes and tires account for 5-10% each. Most of it comes out the exhaust pipe. Also seen some articles that say that cooking with natural gas creates a lot of indoor pollution.
Say to me getting rid of gasoline and diesel cars will help a lot. Also getting rid of gas stoves and furnaces would also help.
One thing I don't see talked of much, driers. The exhaust from gas driers to me seems like something really dodgy.
On the contrary, particulate "nitrogen dioxide (NO2) and oxides (NOx), ozone (O3)" is at its maximum around busy roads.
In a room it decades quickly if you block airflow.
I have a PM detector and I can see that every day.