Haze Day 烟霾助手中文

Do air purifiers help during haze?

A HEPA purifier sized for the room removes fine particles and can noticeably lower indoor PM2.5, especially with windows closed. It does not replace staying indoors during very high readings.

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Getting the most from one

Keep doors and windows closed, run it continuously in the room where you spend most time, and replace filters on schedule.

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Sources

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.