Table 2

Pearson correlation coefficients among the environmental variables. Valencia, 1994–1996

Variable	Temperature	Humidity	Black smoke	SO₂ 24 h	NO₂ 1 h	CO 24 h	O₃ 8 h
Temperature	1	0.07	−0.41	−0.42	−0.10	−0.55	0.45
Humidity		1	0.07	−0.18	−0.10	−0.02^2-150	−0.10
Black smoke			1	0.63	0.33	0.64	−0.57
SO₂ 24 h				1	0.22	0.74	−0.35
NO₂ 1 h					1	0.03^2-150	−0.26
CO 24 h						1	−0.42
O₃ 8 h							1

24 h daily average; 1 h: daily one hour maximum level; 8 h daily eight hours moving average maximum level.
↵2-150 p>0.05.