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Table 2 Mean (± SD) concentrations of PM2.5 (μg/m3) from 2006–2011 in the study areas

From: Methylation at cg05575921 of a smoking-related gene (AHRR) in non-smoking Taiwanese adults residing in areas with different PM2.5 concentrations

Area n 2006–2011 2006 2007 2008 2009 2010 2011
Northern 18 27.32 ± 4.34 27.43 ± 5.03 28.69 ± 5.39 27.33 ± 5.48 25.96 ± 5.32 25.98 ± 5.37 26.61 ± 5.30
North-Central 12 28.65 ± 2.13 29.81 ± 2.34 29.39 ± 2.98 29.75 ± 2.59 28.74 ± 2.47 26.93 ± 1.82 27.28 ± 2.84
Central 16 35.72 ± 3.75 36.27 ± 3.20 36.64 ± 3.81 35.56 ± 3.76 37.67 ± 3.63 34.83 ± 3.02 36.17 ± 5.34
Southern 7 39.81 ± 2.10 40.75 ± 2.30 41.00 ± 2.91 41.62 ± 3.37 40.08 ± 3.41 36.81 ± 3.15 38.05 ± 4.04
  1. SD standard deviation, n number of monitoring stations