HI, thanks for using healthcare magic Normally if a person is allergic to a particular agent, avoidance is advised but since it would be very difficult to avoid pollutants, you would have to use medication as you mentioned. Topical nasal sprays that are commonly used in persons with these symptoms are nasonex, nasocort, flonase, rhinocort In addition to the sprays, you can consider trying antihistamine/decongestant combinations such as zyrtec d, claritine d, allegra d. If the combination of these medications is not enough to help your symptoms, some persons try medications such as singulair or ketotifen. These medications work at different points in the allergy response. I hope this helps