Bacteria, mold, dust mites, pollens: they may be microscopic, but they can be powerful allergy triggers — and they’re all lurking in various places in your home. They can cause sneezing, coughing, watery eyes, nasal congestion, headaches, tiredness, dizziness and difficulty breathing for an estimated 40 to 50 million allergic Americans. But keeping a clean home can make a significant difference in stifling your symptoms. Here are 11 tips to help you allergy-proof your home.