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During March 2013–December 2014, we conducted a field study in Shanghai, China. A total of 409 children's bedrooms had valid data for formaldehyde which was continuously measured for 24 h. The daily 24 h-averaged and night 6 h-averaged (00:00–06:00) concentrations were 21.5 μg/m3 and 22.2 μg/m3, respectively. Bedrooms with mechanical ventilation had lower formaldehyde concentrations than those with...
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