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Table 1 Indoor formaldehyde concentrations in recently renovated homes in six cities of Chinaa [8]

From: Indoor Air Pollution and Its Control in China

City Sample number Formaldehyde concentration (mg/m3) Percentage above standardb (%)
Mean ± SD Range
Beijing 530 0.210 ± 0.152 0.025–1.382 75.5
Tianjin 164 0.267 ± 0.170 0.025–1.100 89.6
Shanghai 182 0.205 ± 0.135 0.025–0.869 79.1
Chongqi 198 0.142 ± 0.084 0.025–0.461 64.6
Shizuishan 212 0.610 ± 0.311 0.104–1.712 100
Changchun 201 0.412 ± 0.208 0.025–1.243 96.0
Total 1,487 0.290 ± 0.238 0.025–1.712 82.3
  1. aSampling time: January to April 2003; time since renovation: <6 months
  2. bThe “Indoor air quality standard” of China (GB/T 18883-2002) stipulates the indoor limit of 0.10 mg/m3 (1-h average) for formaldehyde