Greetings Terri,
I assume Mt. Prospect, like every other town in the Midwest, has a wide variety of tree species.
Therefore, please read the following information from About.com "Forestry" related to the topic of pollen-friendly and pollen-unfriendly tree species:
http://forestry.about.com/od/difficultissues/a/tree_allergy.htm
Best of luck!