I didn't read the article, but I wonder if the amount of pollution reaching your lungs can be lessened some by breathing through your nose rather than through your mouth. You've got a lot more hairs and mucus and disgusting stuff like that that will trap stuff in your nasal passageways than through your mouth. I've found that even when breathing heavy, I can get in a good amount of breath quickly through my nose, although not so quickly breathing out. So I often try to breath in through the nose and out through the mouth, especially in heavy traffic.