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Table 7 Concentration-passing rates of dust, bacteria, and fungi on inner surface of air ducts of central air-conditioning and ventilation systems in public places of Chinaa

From: Indoor Air Pollution and Its Control in China

Area Sampling time Number of public place Dust Bacteria Fungi References
Sample number Passing rateb (%) Sample number Passing ratec (%) Sample number Passing rated (%)
Hebei (Shijiazhuang) 2010 22 110 70.0 110 88.2 110 80.0 [33]
Hunan 2010 24 24 58.3 24 75.0 24 100.0 [34]
Pearl River Delta 2009–2010 25 170 68.2 170 99.4 170 100.0 [35]
Guangdong (Zhongshan) 2009 18 183 95.6 183 94.5 183 88.0 [36]
Fujian (Xiamen) 2009 43 398 98.5 398 97.2 398 95.0 [37]
Zhejiang 2009 240 237 75.5 236 94.9 236 70.8 [38]
Jiangsu 2009 97 312 67.3 458 90.6 456 89.7 [39]
Liaoning (Dalian) 2008 14 14 64.3 69 97.1 69 97.1 [40]
Beijing 2008 12 56 67.9 56 76.8 56 53.6 [41]
Hunan (Changsha) 2008 15 61 50.8 61 50.8 61 59.0 [41]
Tianjin 2006 16 113 89.4 113 71.7 [42]
Henan (Jiaozuo) 2006 16 96 59.4 96 47.9 96 41.7 [43]
  1. aEvaluated based on the “Hygienic norm for central air-conditioning and ventilation systems in public places” of China
  2. bPercentage of samples with dust concentrations ≤ 20 g/m2
  3. cPercentage of samples with bacteria concentrations ≤ 100 cfu/cm2
  4. dPercentage of samples with fungi concentrations ≤ 100 cfu/cm2