Bad news, the people driving cars in that traffic are breathing in the exact same fumes. The cabin air doesn't magically get rid of pollutants because it went through a paper filter meant to keep out large particulates. The asthma/cancer causing pollutants go through just fine.
In fact in slow moving traffic where two wheelers are allowed to filter, I'd expect they are getting exposed to fewer pollutants because they are spending less time in traffic. Plus cyclists get improved cardio which helps negate breathing problems.
Anecdotally the physical health difference between no exercising and mildly exercising while commuting is mind-blowing. And the fact that so many able-bodied office workers couldn't run a mile uninterrupted due to a car-dependent lifestyle should be terrifying.
This is terrifying. Americans are running headfirst into the Greatest Depression, except this time they are the Nazis and they have enough nukes to eradicate life on Earth.
And their political discourse oscillates between "serves us right" and "yes daddy". Republicans are complicit and literally everyone else will refuse to resort to political violence or disobedience even as Trump orders nukes to be fired at whoever he's mad at that week.