My commute in the morning - 20 miles with 30% rural, 60% town with light traffic- has me hacking black stuff off my chest whilst in the shower, it's always been like this. Anyone else?
I don't smoke, never have and it looks much too particulate to be blood. Doesn't happen if I run or swim in the morning. I was wondering about popping to the dr's to see if there could be any longterm issues before I consider some sort of mask.
Anyone arrived at any conclusions regarding this?

