There is a strange expectation that you can't have a good laugh about your products if they are not otherwise perfect. I'm not a sociologist, but something tell me that when the discussion shifts on non-essential elements like the HEPA filter, people assume the rest of the car just works.
I'm asthmatic and I've been told people in a car are more exposed to polluants than cyclists. Should I consider a Tesla ;)?
in all seriousness, just buy any car and install the optional hepa filter. no American car install them by default, saving them some $0.50 in production costs. but you can then buy the filters for $10 and install yourself in under two hours. you can even add the active carbon polymer sheet to prevent outside smell.