I've long thought cars should be equipped with HEPA and activated carbon filters to purify incoming air. If any of you here is involved with the car industry in any way, please help get this message out!
Of course, you can always buy a filter and power it off the cigarette lighter, but really who's going to do that? (OK I did, but that's me)
Then there's personal devices like respirators (search under 'pollution masks' for detailed threads) that drivers and bikers can both take advantage of. I myself use a product made by Respro; others here prefer the more rigorous half-mask respirators by manufacturers such as 3M, etc. Bottom line: They work, but ppl will look at you funny. Who cares though? It's sending out the message that 'hey, I don't want to breathe your filthy dirty air!' or possibly 'I have SARS and don't want to spread it!" Either way, you'll get people thinking...and that's always a good thing.