I figured it out - stay indoors

Oak pollen is still at the 8.8 out of ten level according to one weather website. Once the rain stopped washing the air out, I went into avoidance. Out there, humidity holds the grains in suspension, but it's not as bad as the hot windy days. In the late afternoon, I try for outdoor activity in small spurts and wash my hands and face afterwards. After all these years of feeling sick for a couple of weeks, I finally know what to do.