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Los Angeles has one of the most pleasant climates in the world for ventilation on paper — mild year-round temperatures (18–28°C daily range) and low humidity especially inland. The marine layer that rolls in from the Pacific most evenings creates natural cooling: opening windows after sunset brings fresh, cool ocean air on most evenings from May through October.
However, LA's air quality is the dominant factor in the OpenWindow.live recommendation. The South Coast Air Quality Management District monitors over 30 stations across the basin. Smog alerts still occur regularly, particularly in the San Fernando Valley and Inland Empire. During wildfire season (October–November), AQI can reach "Hazardous" levels across the entire metro area within hours.
The practical rule for LA: check the AQI before the temperature. A 22°C evening with AQI 150 from wildfire smoke is far worse for indoor air quality than a 28°C afternoon with AQI 30. OpenWindow.live weighs both automatically in its recommendation.
À Los Angeles, les meilleurs moments pour aérer sont généralement tôt le matin (5–8h) et le soir tard, quand la température extérieure passe sous celle de l'intérieur.
Oui, dans la plupart des cas. Ouvrir les fenêtres peut faire baisser la température intérieure de 2–5°C en 30 minutes si l'air extérieur est plus frais.
Au-dessus de 80%, ouvrir les fenêtres rend l'air collant. Mieux vaut attendre des heures plus sèches.