I've heard that consuming honey from your local variety of bees can help - but the evidence base isn't great [1]
[1] https://www.honeyshoney.co.uk/blogs/news/local-honey-and-hay...
[1] https://www.honeyshoney.co.uk/blogs/news/local-honey-and-hay...
At least, that was my experience, I blamed Cambridge, then moved back or even when I visited before that had it just as bad in the town I grew up in. (Cripplingly painful eyes, sometimes migraines. Nose generally fine, but steroidal nasal spray is the best I've found off prescription for my eyes. Eye drops only really seem to help by way of lubrication for me (even though they are active), and pills (best I've tried is fexofenadine) don't give that instant relief.)