Table 1 Population-weighted scaled semivariances, , Pearson correlation coefficients, , and model parameters used in the Monte Carlo simulations to simulate amount of error (σ _err ) and error type (σ _InZ /σ _InZ* )

1-hr max NO₂

0.516

0.320

1.46

0.57

1.77

1-hr max NO_x

0.384

0.445

1.12

0.67

1.50

8-hr max O₃

0.051

0.903

0.33

0.95

1.05

1-hr max SO₂

0.517

0.319

1.46

0.56

1.77

1-hr max CO

0.411

0.418

1.18

0.65

1.55

24-hr PM₁₀

0.192

0.678

0.69

0.82

1.21

24-hr PM_2.5

0.100

0.819

0.47

0.90

1.11

24-hr PM_2.5-SO₄

0.068

0.873

0.38

0.93

1.07

24-hr PM_2.5-NO₃

0.140

0.754

0.57

0.87

1.15

24-hr PM_2.5-NH₄

0.149

0.741

0.59

0.86

1.16

24-hr PM_2.5-EC

0.337

0.495

1.01

0.70

1.42

24-hr PM_2.5-OC

0.175

0.702

0.65

0.84

1.19