I have a bit of issue with my sinus' when the pollen count is this high. It requires that I clear my nose fairly regularly, lest I end up with it down the side of my face. While out riding alone, or with one or two other people it doesn't really pose any issue as I can just fall back and do what I need to do. On club nights, in a pace line, it poses it's own issues and I really don't know what most people do/say when the need arises.
The last thing I want to do is commit a biological attack on my riding mates.