Originally Posted by randya
It's not about whether you breath through your nose or mouth, it's about using your diaphram and not just your ribcage to inhale and exhale. And, IMO, it's best to stop breathing momentarily if possible when riding through clouds of exhaust gas....
The thing I normally do is adjust my speed a little so I'll go through exhaust on my exhale. Then I proceed with breathe in w/nose, breathe out w/mouth. My breathing has a rhythm that usually goes with my cadence.