What can be done to ensure I have adequate ventilation?

If it’s a new house or apartment, ask to see the independent ventilation verification cert. Ensure all vents are open and clear. Do not block vents. Open the windows every morning to purge the house with fresh air. avoid drying clothes inside if possible. If this is not possible ensure the space is well ventilated by opening windows or installing a good mechanical extract fan. Ensure all bathrooms and shower rooms have extract fans and they are working correctly

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