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. 2016 Oct 13;6:34947. doi: 10.1038/srep34947

Table 3. Spearman correlation coefficients among air pollutants.

Air pollutants Total (N = 75) Wuhan (N = 41) Zhuhai (N = 34)
NO2 PM10 O3 PM2.5 NO2 PM10 O3 PM2.5 NO2 PM10 O3 PM2.5
NO2, μg/m3 1       1       1      
PM10, μg/m3 0.59* 1     0.53* 1     0.37† 1    
O3, μg/m3 0.37* 0.51* 1   0.31 0.28 1   0.23 0.39† 1  
PM2.5, μg/m3 0.69* 0.90* 0.44* 1 0.54* 0.94* 0.25 1 0.80* 0.64* 0.21 1

Abbreviations: NO2, nitrogen dioxide; O3, ozone; PM10, particulate matter <10 μm in diameter; PM2.5, particulate matter <2.5 μm in diameter.

*p < 0.01; †p < 0.05.