From Gemini Yes, mould can absolutely grow under those conditions—in fact, it is almost a certainty. An environment with 80% relative humidity combined with Thailand's typical warm ambient temperatures (usually between 25°C and 32°C indoors) creates the absolute perfect breeding ground for mould spores. Here is a breakdown of why this happens and where you will likely see it first: The 60% Threshold Mould spores exist naturally in the air everywhere, but they remain dormant until they find moisture. Below 60% RH: Mould struggles to grow. 70% RH: Growth becomes possible, especially in stagnant air. 80%+ RH: Growth becomes aggressive and rapid. At this level, surfaces absorb moisture directly from the air, providing the exact environment spores need to germinate within 24 to 48 hours. High-Risk Zones in a Closed Condo If a condo is left locked up without air conditioning or a dehumidifier, moisture gets trapped, and the lack of airflow accelerates the problem. You will usually find mould appearing first on: Organic & Porous Surfaces: Leather shoes, bags, and belts; wooden furniture (especially the unvarnished backs or insides of wardrobes); and clothing. Walls and Ceilings: Especially behind furniture where air doesn't circulate, or near the bathroom and kitchen walls. Bedding and Mattresses: Fabrics will absorb the airborne moisture and start to smell musty before visible patches even appear.
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