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Table 2 Annual average concentration of air pollutants in Suzhou City in 2014–2016

From: The relationship between air quality and respiratory pathogens among children in Suzhou City

Index 2014 2015 2016 F P
PM2.5 66.38 ± 22.22 57.51 ± 23.40ab 45.41 ± 22.04a 97.54 < 0.001
PM10 89.94 ± 26.25 80.51 ± 26.77ab 71.27 ± 24.96a 51.4 < 0.001
NO2 51.72 ± 13.74 50.58 ± 14.37b 48.71 ± 13.91a 7.40 0.025
SO2 23.06 ± 7.68 21.23 ± 7.65ab 16.84 ± 5.30a 72.69 < 0.001
CO 0.93 ± 0.18 0.93 ± 0.21 0.94 ± 0.19 3.03 0.220
O3 55.98 ± 22.03 57.44 ± 23.63 60.07 ± 22.86 4.07 0.131
Number of patients 1959 1812a 1716a 16.56 < 0.001
  1. Note: Compared with 2014, ap < 0.05; compared with 2016, bp < 0.05