. Author manuscript; available in PMC: 2011 Nov 1.

Published in final edited form as: Atmos Environ (1994). 2010 Nov 1;44(36):4545–4552. doi: 10.1016/j.atmosenv.2010.08.024

Table 2.

Correlations among pollutants indoors and outdoors, stratified by season.

Analyte	Location	Heating season			Nonheating season
Analyte	Location	N	Abs	PM_2.5	N	Abs	PM_2.5
Σ₈PAH_nonvolatile	Indoor	201	0.472^**	0.381^**	97	0.366^**	0.242^*
Σ₈PAH_nonvolatile	Outdoor	67	0.298^*	0.265^*	31	0.065	−0.349
Σ₈PAH_semivolatile	Indoor	201	0.106	0.119	97	0.002	0.018
Σ₈PAH_semivolatile	Outdoor	67	0.372^**	0.290^*	31	0.331	0.579^**
Pye	Indoor	201	0.190^**	0.207^**	97	0.239^*	0.011
Pye	Outdoor	67	0.443^**	0.317^*	31	0.452^*	0.201
PM_2.5	Indoor	208	0.570^**	1	100	0.358^**	1
PM_2.5	Outdoor	70	0.876^**	1	32	0.501^**	1

Pearson correlation coefficient performed on log-transformed data;

p-value < 0.05;

^**

p-value< 0.001