SO₂

NO₂

PM_2.5

${\overline{x}}_i$

0.3796

0.5443

0.4054

${\sigma }_i$

0.3276

0.3619

0.3374

$v_i$

0.8630

0.6649

0.8322

$w_i$

0.3657

0.2817

0.3526