Toxic air: Indoors as bad as outdoors

Delhi’s air pollution is dangerously high, and a week-long Hindustan Times field test has found that indoor air in schools, hospitals and homes is nearly as polluted as the air outside. Closing doors and windows does little to protect people because outdoor toxic air seeps indoors through ventilation, gaps and open spaces. At the tested school and hospital, PM2.5 levels were often many times above safe limits, even inside. Only in a home with a continuously running high-efficiency air purifier did the pollution drop to safer levels. Experts say this shows that just staying indoors is not enough to avoid very poor air quality — major improvements to outdoor air are needed.

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