Use your air conditioner. Air conditioning reduces the amount of airborne pollen from trees, grasses and weeds that finds its way indoors. Air conditioning also lowers indoor humidity and can reduce your exposure to dust mites. If you don't have air conditioning, try to keep your windows closed during pollen season. Decontaminate your decor. Minimize dust that may worsen nighttime symptoms by replacing certain items in your bedroom. Prevent mold spores... Reduce pet dander. If you're allergic to dander, avoid pets with fur or feathers.