Table 2.

Population-weighted correlations between measurement error and true values, R(ε,Z^*), and between measurement error and measured values, R(ε,Z), where the true values, Z^*, are the true ambient concentration fields and the measured values, Z, are the monitor-based metrics of central monitor (CM), unweighted average (UA), population-weighted average (PWA), and area-weighted average (AWA) and the true population-weighted average (TPWA). Standard deviations of the correlations for 10 independent sets of CO simulations are shown.

pollutant	CM		UA		PWA		AWA		TPWA
	R(ε,Z*)	R(ε,Z)	R(ε,Z*)	R(ε,Z)	R(ε,Z*)	R(ε,Z)	R(ε,Z*)	R(ε,Z)	R(ε,Z*)	R(ε,Z)
NO2	−0.46	0.61	−0.73	0.20	−0.78	0.14	−0.87	−0.04	−0.82	0.0017
NO x	−0.11	0.81	−0.63	0.29	−0.81	0.02	−0.96	−0.31	−0.80	−0.00042
CO	−0.09 ± 0.02	0.86 ± 0.02	−0.48 ± 0.03	0.53 ± 0.04	−0.78 ± 0.02	0.17 ± 0.05	−0.99 ± 0.004	−0.21 ± 0.04	−0.86 ± 0.015	0.0016 ± 0.000045
SO2	−0.40	0.74	−0.73	0.35	−0.79	0.25	−0.88	0.08	−0.86	−0.0003
O3	0.03	0.39	−0.2	0.11	−0.21	0.11	−0.25	0.07	−0.28	−0.0006
PM10	−0.32	0.40	−0.43	0.15	−0.44	0.14	−0.51	0.07	−0.51	0.00039
PM2.5	−0.10	0.41	−0.28	0.14	−0.28	0.14	−0.29	0.13	−0.38	0.00065
SO42−	−0.05	0.41	−0.27	0.10	−0.25	0.12	−0.45	−0.09	−0.34	−0.00035
NO3−	0.08	0.58	−0.31	0.13	−0.38	0.05	−0.57	−0.16	−0.40	0.0022
NH4+	−0.37	0.28	−0.45	0.06	−0.45	0.07	−0.51	−0.02	−0.46	−0.00027
EC	−0.28	0.64	−0.65	0.14	−0.71	0.06	−0.85	−0.17	−0.70	−0.00007
OC	−0.18	0.54	−0.45	0.13	−0.46	0.12	−0.62	−0.07	−0.51	0.00007