Environmental Health and Preventive Medicine

Table 2 Spearman’s correlation coefficients for relationships between air pollutants and weather conditions

From: Association between gaseous pollutants and emergency ambulance dispatches for asthma in Chengdu, China: a time-stratified case-crossover study

	SO₂	NO₂	CO	O₃	PM_2.5	Temperature	Humidity	AP
SO₂	1
NO₂	0.474^a	1
CO	0.615^a	0.678 ^a	1
O₃-8 h	− 0.047^a	− 0.195^a	− 0.383^a	1
PM_2.5	0.622^a	0.785^a	0.817^a	− 0.205^a	1
Temperature	− 0.084^a	− 0.431^a	− 0.474^a	0.680^a	− 0.462^a	1
Humidity	− 0.446^a	− 0.137^a	− 0.058^a	− 0.428^a	− 0.190^a	− 0.078^a	1
AP	0.079^a	0.365^a	0.363^a	− 0.596^a	0.335^a	− 0.851^a	− 0.002	1

Abbreviations: SO₂ sulfur dioxide, NO₂ nitrogen dioxide, CO carbon monoxide, O₃-8 h daily 8-h mean concentration of O₃, PM_2.5 particulate matter less than 2.5 μm in aerodynamic diameter, AP atmospheric pressure
^aP < 0.05

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