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Table 3 Seasonal distribution of air pollution

From: The association between air pollution and preterm birth and low birth weight in Guangdong, China

Seasons Month PM2.5 (μg/m3) PM10 (μg/m3) SO2 (μg/m3) NO2 (μg/m3) CO (mg/m3) O3 (μg/m3)
Spring 3 39.07 57.47 15.51 31.28 1.14 43.17
4 35.49 54.48 14.77 26.80 1.05 59.98
5 24.13 39.66 12.15 23.18 0.96 48.45
Summer 6 20.63 36.97 11.32 18.50 0.84 50.32
7 23.15 39.42 11.58 17.13 0.85 56.71
8 23.55 39.78 13.21 18.59 0.84 54.88
Autumn 9 29.63 46.25 12.90 19.92 0.91 65.72
10 47.82 72.16 17.18 26.44 1.01 84.18
11 40.27 60.60 15.87 28.73 1.06 54.30
Winter 12 41.15 62.21 17.85 33.73 1.08 44.50
1 66.24 93.57 22.40 43.53 1.34 61.65
2 46.38 62.55 13.80 28.46 1.18 52.80