I use the past tense, because getting older means my allergy has abated. It only gets bad if I mow the lawn, so now I wear a mask doing that.
A mask does help, which I’ve been wearing for… obvious reasons but exercising in a N95 is rough.
I'm sure you've already considered it, but move north were there are seasons and no pine trees :-/ The rain in Seattle tends to wash the pollen out of the air, too.
For me its grass. Even walking in grass with shorts on is a no-no.
Luckily none of them are that severe, but it’s just so many things… I got allergy shots for a few years in my teens which helped a lot, so it isn’t normally that much of a problem, but I’m also a bit asthmatic so exercise outdoors is a big trigger.