Table 2.

Correlation among air pollutants (CO, NOx, O₃, PM₁₀, PM_2.5, SO₂, and PM_10−2.5) using Spearman’s analysis

Pollutants	CO	NOx	O3	PM10	PM2.5	SO2	PM10−2.5
CO	1.000	0.945*	−0.570*	0.040*	0.068*	0.196*	−0.004*
NOx	–	1.000	−0.547*	0.057*	0.105*	0.232*	−0.017*
O3	–	–	1.000	0.249*	0.141*	−0.083*	0.307*
PM10	–	–	–	1.000	0.892*	0.495*	0.843*
PM2.5	–	–	–	–	1.000	0.418*	0.508*
SO2	–	–	–	–	–	1.000	0.446*
PM10−2.5†	–	–	–	–	–	–	1.000

CO, carbon monoxide; NOx, nitrogen oxides; O₃, ozone; PM, particulate matter; SO₂, sulfur dioxide.

*P < 0.05.

†PM₁₀minus PM_2.5.