Avoid heavy drapes or venetian blinds. Choose baseboard heating over forced air for your home. If you're stuck with forced air, add a high quality electronic filter or even a hepa filter to the system. Replace the filters regularly. Remove your indoor plants and flowers.
Wet earth is a breeding ground for mold.
Have someone else mow the lawn. Dry your sheets in the dryer instead of on the line. They collect airborne pollens when hung outside. Take a vacation during high season. Choose a location that will have already passed the pollen season.