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Table 1 Air pollution and meteorological data in Ningbo, China (2014–2016)

From: Association between ambient air pollutants and preterm birth in Ningbo, China: a time-series study

  Mean ± SD Minimum P25 P50 P75 IQR Maximum
ALL year Cold Perioda Warm Period
Air pollutants
 SO2 (μg/m3) 16.56 ± 9.05 18.91 ± 10.25 14.25 ± 6.97 5.90 10.53 13.70 19.09 8.56 74.08
 NO2 (μg/m3) 40.50 ± 16.88 49.85 ± 15.99 31.28 ± 11.94 5.59 28.00 37.38 51.34 23.34 115.00
 PM10 (μg/m3) 69.69 ± 38.37 87.03 ± 41.75 52.60 ± 24.85 10.18 42.90 60.20 85.31 42.41 287.10
 PM2.5 (μg/m3) 43.73 ± 26.26 55.64 ± 29.38 31.99 ± 15.55 4.24 25.50 37.38 54.11 28.62 196.93
 O3 (μg/m3) 64.33 ± 29.71 53.46 ± 25.07 75.05 ± 30.05 8.17 42.99 61.96 83.02 40.03 244.30
 CO (mg/m3) 1.06 ± 0.35 1.13 ± 0.39 0.99 ± 0.28 0.04 0.88 1.00 1.19 0.31 2.92
Meteorology
 Temperature (°C) 17.42 ± 8.10 10.64 ± 5.17 24.10 ± 3.76 −4.47 10.23 18.69 23.94 13.71 32.25
 Relative Humidity (%) 76.8 ± 11.80 74.29 ± 13.38 79.19 ± 9.33 32.96 69.82 77.81 85.47 15.65 97.60
  1. PM2.5: particulate matter less than 2.5 μm in aerodynamic diameter, PM10: particulate matter less than 10 μm in aerodynamic diameter, SO2: sulfur dioxide, NO2: nitrogen dioxide, O3: Ozone, CO: carbon monoxide
  2. aCold period was from November to April, and warm period was from May to October
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