Table 2.

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

	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

Abbreviations: hour (h).

All correlation coefficients were statistically significant (p < 0.001).