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Table 2 Mean (± SD) concentrations of PM2.5 (μg/m3) from 2006 to 2011 in the northern and central/southern areas

From: SOX2 promoter hypermethylation in non-smoking Taiwanese adults residing in air pollution areas

Area

n

2006

2007

2008

2009

2010

2011

Northern

18

27.43 ± 5.03

28.69 ± 5.39

27.33 ± 5.48

25.96 ± 5.32

25.98 ± 5.37

26.61 ± 5.30

Central/southern

23

37.69 ± 3.59

38.03 ± 4.05

37.48 ± 4.59

38.44 ± 3.67

35.46 ± 3.14

36.75 ± 4.97

  1. SD standard deviation, n number of monitoring stations