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Table 2 Pairwise Spearman correlation coefficients for three-day moving average ambient air pollutant concentrations.

From: Implications of different approaches for characterizing ambient air pollutant concentrations within the urban airshed for time-series studies and health benefits analyses

  Correlation between central monitor and unweighted average Correlation between central monitor and population-weighted average Correlation between population-weighted average and unweighted average
8-h ozone 0.988 0.979 0.988
24-h PM10 0.956 0.961 0.990
24-h PM2.5 0.969 0.963 0.995
24-h PM2.5 sulfate 0.938 0.957 0.989
24-h PM2.5 organic carbon 0.847 0.891 0.975
24-h PM2.5 elemental carbon 0.831 0.804 0.966
1-h nitrogen dioxide 0.831 0.868 0.919
1-h carbon monoxide 0.960 0.946 0.980
1-h sulfur dioxide 0.849 0.917 0.954
  1. Abbreviations: hour (h).
  2. All correlation coefficients were statistically significant (p < 0.001).