All of those things combined conspired to make you feel badly, but the air quality alert should not be taken lightly, especially combined with the high pollen count. We had several days of this around here, and I rode, despite the fact that I know it will make me feel sick and can start an asthma incident. Even if you don't have asthma, it's just not good for you to be exerting yourself when the ozone is high.
Hopefully, a storm will come and blow that stuff out of there!