I think there are some studies from here in the UK which indicate that air quality may actually be worse inside motor vehicle cabins than it is outside [1]. Th

I think there are some studies from here in the UK which indicate that air quality may actually be worse inside motor vehicle cabins than it is outside [1]. This may be mitigated in newer vehicles with particulate filters, I am not sure. I don't know whether filters can eliminate NOX as well as PM2.5. [1] http://www.bbc.co.uk/news/health-35504768 http://www.bbc.co.uk/news/health-35504768