Your 12 Worst Allergy Mistakes
You leave windows open
Make it a rule to keep your windows closed and the air conditioner on when it's pollen season.
Be sure to set the AC to "recirculate," and if it’s not hot outside, you can keep it in filter-only mode. Using an air conditioner in your car can cut the amount of pollen you breathe by as much as 30%, says Myngoc Nguyen, MD, chief of allergy at Kaiser Permanente Medical Center, Northern California.