Table 4.

The correlation between the mass concentrations of individual PAHs in particle fractions PM₁, PM_2.5, PM_2.5–1, PM₁₀, and PM_10–2.5 for the whole sampling period (all correlation coefficients were significant at p < 0.05).

PAH	PM2.5 vs. PM10 1			PM1 vs. PM2.5 2			PM1 vs. PM2.5–1 3			PM2.5 vs. PM10–2.5 4
	a	b	r	a	b	r	a	b	r	a	b	r
Flu	0.276	0.243	0.594	0.854	0.058	0.834	0.794	0.169	0.480	0.254	0.222	0.507
Pyr	0.346	0.153	0.630	0.843	0.049	0.728	0.695	0.157	0.640	0.253	0.181	0.512
BaA	0.178	0.222	0.492	0.670	0.067	0.880	0.916	0.146	0.608	0.161	0.256	0.406
Chry	0.267	0.339	0.580	0.743	0.040	0.917	0.889	0.259	0.443	0.244	0.401	0.513
BbF	0.280	0.551	0.512	0.732	0.205	0.821	0.698	0.467	0.460	0.174	0.583	0.340
BkF	0.398	0.246	0.547	0.703	0.078	0.864	0.692	0.260	0.430	0.088	0.319	0.133 *
BaP	0.182	0.432	0.659	0.833	0.060	0.912	0.879	0.487	0.424	0.180	0.485	0.583
DahA	0.254	0.089	0.512	0.594	0.036	0.672	0.381	0.068	0.366	0.238	0.097	0.411
BghiP	0.353	1.043	0.714	0.553	0.326	0.894	0.826	0.780	0.680	0.360	1.160	0.653
IP	0.336	0.356	0.687	0.767	0.109	0.915	0.989	0.404	0.521	0.293	0.474	0.563
ΣPAH	0.292	3.570	0.660	0.794	0.176	0.968	0.969	3.360	0.497	0.293	4.274	0.553

¹ linear regression line (PAH)_PM2.5 = a × (PAH)_PM10 + b; ² linear regression line (PAH)_PM1 = a × (PAH)_PM2.5 + b; ³ linear regression line (PAH)_PM1 = a × (PAH)_PM2.5–1 + b; ⁴ linear regression line (PAH)_PM2.5 = a × (PAH)_PM10–2.5 + b; * the correlation was not significant.