Grass, weed, tree, just some of the sources of pollen that can send our allergies off.
In my experience, I’ll react (itchy eyes, etc.) for a day or two, then it will wane. Certainly the pollen I’m reacting to doesn’t magically disappear in a day. What processes do I have to thank that allow me to suffer only a relatively short time? Are the allergen in pollen unstable and break down quickly on their own? Are there bacteria or other life forms that are helping to break the allergens down?
There's nothing in that direction that would help. The most important thing is to get rid of the pollen. Have a quarantine regime at home: You come home you get rid of the clothes you wore outside and take shower to wash away anything that makes you allergic. Especially whats in your hair and on your face. Treat your bedroom and your sheets carafully in that regard. Install a pollen-proof net on the window. That's extreme but the only thing that really helps. There's also antihistamines and cream you can use on your face, eye drops as well. That's only treating the symptoms though...