Originally Posted by APTokyo

I bike 3-4 days a week, 40km round trip in Tokyo. The air here is not terrible, but I have to ride on major roads and there are no nice trails or anything like that. I spend a lot of time behind buses and delivery trucks and after the first few weeks of commuting, I got tired of that taste in my mouth. By the time I got to work, I could feel a dry tickle in my throat and would cough. I hated to think I was breathing in some garbage into my lungs every day.