I've been commuting on my bike a few times to downtown and back now. I've definitely noticed the car exhaust fumes, especially when stopped. Not to be paranoid, but for those of you who commute alot do you ever think of ways to avoid the constant inhale of the fumes? Since you're faced with it day in and day out, it must not be too healthy for you, have you thought of creative ways to avoid it? I was thinking someone could where one of those surgeon/nurse masks, if that helps filter it at all.