|MadSci Network: Zoology|
Wasps and bees (family Hymenoptera) do have chemosensors on their antennae that are capable of detecting CO2. They also usually have large, well developed compound eyes, and pretty good vision - so while can "smell" the CO2 you emit, they can also track you visually without any problems. I'd say that the best strategy to employ after disturbing a nest is still to run as fast as you can!
Hope that helps,
Rob Campbell, MAD Scientist
Try the links in the MadSci Library for more information on Zoology.