Molds start growing when relative humidity is above 55% for at least a day or two. Good ventilation, regular vacuuming with a HEPA filter, and watching out for organic materials that molds love can all help prevent problems. You can use a dehumidifier, A/C on dry mode, and even rock salt to lower humidity.

Read more in: Reduce high humidity levels in your home, breathe more easily

All 25 Days for Healthier Homes and Offices tips