1) Vacuum–Use a machine that captures dust and does not blow it back into the air. Good vacuums reduce allergen particles, and are asthma and allergy friendly.
2) Air purifiers–Purifiers with high-efficiency particulate air (HEPA) filters are the best option. They remove at least 99.97 percent of airborne particles. This includes mold spores that normally float around in the air you breathe.
3) Mold–Remove it. Use elbow grease, soap, water and bleach to cleaning the moldy area. Dead causes allergic reactions so after you kill mold, remove it.
4) Leaks-eliminate them. Mold loves water.