Should I open windows or use the air-con during haze?

Keep windows closed when the reading is elevated or worse. Use air-conditioning in recirculation mode or a fan indoors, and air the home briefly only when the reading is low.

Singapore now · loading the official reading…

Why

Outdoor fine particles enter through open windows and vents. Closed windows plus a purifier or recirculating air-con keep indoor levels much lower than outside.

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Windows, purifiers and indoor air during haze
Drying laundry outdoors in haze

Sources

NEA 1-hour PM2.5 readings (Singapore) — National Environment Agency (NEA), Singapore · official site · API / docs

General information, not medical advice. Follow your doctor and your school, league or organiser's final call. Data come from official sources; see data sources.

Should I open windows or use the air-con during haze?

Why

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