Table 4.

Rank correlations coefficients (Spearman’s rho) between different particle measures in the stationary area measurements^a

Aerosol fraction	Inhalable dust Co (mg m−3)	PM2.5 Co (mg m−3)	PM10 Co (mg m−3)	Particle surface area Median (μm2·m−3)	Particle number Median (p·cm−3)
Total dust Co (mg m−3)	0.893b	0.598b	0.945b	−0.583b	−0.159
Inhalable dust Co (mg m−3)		0.527b	0.864b	−0.617b	−0.145
PM2.5 Co (mg m−3)			0.681b	−0.278	0.257
PM10 Co (mg m−3)				−0.557b	−0.097
Particle surface area Median (μm2·m−3)					0.630b

^a n = 28, except for particle particle surface (n = 22) and particle number (n = 27).

^bSignificant correlation at the 0.01 level (two-tailed).