The air on my landing is at 69% humidity. Everywhere advises that indoor humidity should be 40-60% to avoid mouldy walls, the kids needing inhalers, and slugs coming in for a wander around. All sources say to increase ventilation and ensure I open the windows to let the damp air out.
The BBC weather app says outdoor humidity is currently 71%. So how does opening a window help? I feel like I’m missing something.
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What is the indoor humidity? Allowing airflow from an area of greater humidity to an area of lower humidity will decrease the humidity in the more humid area. An outside humidity of 71% is fine to help alleviate an indoor humidity of 85%.
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