Table 2.

Spearman correlations between 5-y exposure to ${\mathrm{PM}}_{2.5}$, ultrafine particles, elemental carbon, and ${\mathrm{NO}}_2$ for the main study population (ages 50–80 y) in 2005 ($N=\mathrm{1,252,432}$).

	$\mathrm{P}{\mathrm{M}}_{2.5}$	Ultrafine particles	Elemental carbon	$\mathrm{N}{\mathrm{O}}_2$
$\mathrm{P}{\mathrm{M}}_{2.5}$	1	0.75	0.75	0.79
Ultrafine particles	0.75	1	0.90	0.92
Elemental carbon	0.75	0.90	1	0.94
$\mathrm{N}{\mathrm{O}}_2$	0.79	0.92	0.94	1