Environmental Health

Table 3 Spearman correlations between O₃, NO₂, and PM_2.5 within each city

From: Associations between ambient air pollutant mixtures and pediatric asthma emergency department visits in three cities: a classification and regression tree approach

City	Pollutant	O₃	NO₂	PM_2.5
	O₃	1.00	0.19^a	0.57^a
Atlanta	NO₂	0.19^a	1.00	0.39^a
	PM_2.5	0.57^a	0.39^a	1.00
	O₃	1.00	0.05^b	0.42^a
Dallas	NO₂	0.05^b	1.00	−0.15^a
	PM_2.5	0.42^a	−0.15^a	1.00
	O₃	1.00	0.22^a	0.29^a
St. Louis	NO₂	0.22^a	1.00	0.25^a
	PM_2.5	0.29^a	0.25^a	1.00

^ap < 0.01
^bp = 0.06

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ISSN: 1476-069X

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