Minimize exposure to pollen and other allergens — if it’s necessary to be outside, it’s best to keep in mind that pollen counts are highest in the early morning and during windy times but lowest during dusk and after rains.
Medicate! These medications can help ease some of the discomfort when it’s necessary to be in areas with high pollen counts:

Immunotherapy can be a last resort when more common medications fail to sufficiently alleviate the pain. The concept is to inject a body with a foreign protein that will induce the production of antibodies that make one less sensitive to a particular allergen (e.g., pollen). Sadly, this both takes a few months to become effective and doesn’t work for everyone.

Find out what works best for you. Allergies are different for each person, so there’s no one cure that is guaranteed to work for everyone. Figure out what combination of tactics is most effective for your own unique set of allergies.