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London's maritime climate means persistent humidity — the city averages 70–80% relative humidity year-round and sees rain on about 150 days per year. This narrows the window for ideal ventilation compared to continental European cities. However, London's mild summers (July highs average 23°C) mean nights rarely stay above 16°C, creating excellent overnight ventilation opportunities that don't exist in hotter cities.
Urban air quality has improved dramatically since the ULEZ expansion. Central London's AQI is typically 30–50 on weekdays, with spikes near busy roads. Air quality is consistently best on weekend mornings before traffic builds — often coinciding with the coolest outdoor temperatures of the week.
Winter in London calls for caution: the combination of high outdoor humidity (85–95%) and cold air can push dew point indoors, risking condensation on cold walls. Short 10-minute ventilation bursts are safer than extended window opening through December and January.
En London, los mejores momentos para ventilar son por la mañana temprano (5–8) y después del atardecer, cuando la temperatura exterior baja de la interior.
Sí, en la mayoría de los casos. Abrir las ventanas puede bajar la temperatura interior 2–5°C en 30 minutos si el aire exterior es más fresco.
Por encima del 80% de humedad, abrir ventanas hace el aire pegajoso. Mejor esperar a horas más secas.