Is road dust safe to breathe?

For the past several summers, I have often wondered if the dust we breathe and the same dust we suck in when it’s spilled into our mouth (when it rains, I mean, for those of us who ride a four-wheeled vehicle) is safe.

I am sure there are professional medical people out there who could answer this question.

I would very much appreciate it if someone can answer this question. Thank you.

Jake Ikeperiar
Hall Beach