Table 3.

Correlation coefficients of different chemical compounds in PM_2.5 and the cell viability and intracellular ROS level

Chemical component	Cell viability		Intracellular ROS level
	24 h	48 h	3 h	6 h
V	0.5440*	0.8456*	0.8456*	0.8714*
Mn	−0.9370	−0.2874	−0.2874	−0.4838
Ni	−0.4064	0.0296	0.4770	0.1994*
Cu	−0.9237	−0.8479	−0.5440	−0.3936
Cd	−0.8284	−0.8432	−0.7824	−0.5694
Ba	−0.7257	−0.4213	0.0586	−0.0560
Pb	−0.8169	−0.8177	−0.7887	−0.7605
OC	−0.9639	−0.7943	−0.5750	−0.4507
EC	−0.9436	−0.8360	−0.6092	−0.4644
SOC	−0.9729	−0.7621	−0.5490	−0.4392
Na+	−0.1803	0.1112	0.3471	−0.5110
NH4 +	−0.3339	−0.2694	−0.4487	−0.9418
K+	−0.6900	−0.7343	−0.6019	−0.8352
Mg2+	−0.3634	−0.0062	0.4817	0.3741
Ca2+	−0.3632	−0.0739	0.4537	0.2974
Cl−	−0.4896	−0.4885	−0.4589	−0.9101
NO3 −	−0.8384	−0.7056	−0.6617	−0.7764
SO4 2−	−0.6335	−0.1494	−0.0206	−0.2741

^*Significant correlation at the 0.05 probability level