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Table 2 Correlation between air pollutants and meteorological factors in Ningbo, China

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

  SO2 NO2 PM10 PM2.5 CO O3 Temperature Relative humidity
SO2 1.00        
NO2 0.59 1.00       
PM10 0.69 0.74 1.00      
PM2.5 0.66 0.74 0.95 1.00     
CO 0.22 0.45 0.43 0.47 1.00    
O3 −0.13 −0.46 −0.13 −0.17 − 0.29 1.00   
Temperature −0.39 − 0.62 − 0.52 −0.50 − 0.20 0.37 1.00  
Relative humidity −0.39 −0.04 − 0.36 −0.24 0.08 −0.33 0.21 1.00
  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. All correlations were statistically significant (P < 0.01)
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