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. Author manuscript; available in PMC: 2016 Dec 1.

Published in final edited form as: Environ Int. 2015 Sep 16;85:104–110. doi: 10.1016/j.envint.2015.09.003

Table 3.

Spearman correlation coefficients among air pollutants

	PM_2.5	EC	CO	NO₂	PN	ozone	SO₂	sulfate	nitrate	pyrene
PM_2.5	1
EC	0.67^b	1
CO	0.69^b	0.58^b	1
NO₂	0.42^b	0.80^b	0.53^b	1
PN	0.11	0.56^b	0.27^b	0.63^b	1
ozone	0.12	−0.30^b	−0.13	−0.58^b	−0.33^b	1
SO₂	0.74^b	0.71^b	0.58^b	0.64^b	0.40^b	0.02	1
sulfate	0.90^b	0.40^b	0.57^b	0.12	−0.21	0.35^b	0.63^b	1
nitrate	0.92^b	0.65^b	0.69^b	0.51^b	0.10	−0.12	0.64^b	0.78^b	1
pyrene	0.76^b	0.75^b	0.69^b	0.61^b	0.41^b	−0.10	0.69^b	0.63^b	0.71^b	1
Total PAHs	0.81^b	0.82^b	0.66^b	0.59^b	0.41^b	−0.13	0.65^b	0.66^b	0.74^b	0.93^b

PN: particle number concentrations

^a

p value < .05

^b

p value < .01