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I bike on city streets. So not only is there the risk of impact, but I'm also breathing all kinds of exhaust. That can't be good...

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realistically, everybody else is also breathing the same air though?

Don't most cabin air filters take out the big particles in diesel exhaust? I think Tesla does at least.

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

Plus, when I'm on my bicycle I'm breathing much harder than most people in cars and I'm in it for longer because I'm slower.

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