I'll see your pollen level and raise you our diesel exhaust particulates.
Here in Central Pennsylvania we've got terrible pollen and we're the truck terminal capital of the east coast, I83, I78, I81 all converge here with 10's of thousands trucks a day. I change my cabin filter 3-4 times a year depending on how black or green/yellow it is. Have started changing intake filters twice a year. The hydrospray at least twice a week to rinse off the tree/flower scum, and spring isn't really here yet!