Table 3 Spearman’s correlation between air pollutants and weather conditions in Jinan, China, 2011–2015.

	SO₂	NO₂	PM₁₀	PM_2.5	Temperature	Humidity	Pressure	Wind speed
SO₂		0.752**	0.529**	0.360**	−0.207**	−0.223**	0.325**	−0.031
NO₂	0.728**		0.533**	0.428**	−0.389**	−0.042	0.528**	−0.376**
PM₁₀	0.563**	0.738**		0.800**	0.064	−0.260	0.110**	−0.038
PM_2.5	0.649**	0.732**	0.854**		0.091	0.010	0.033	−0.184
Temperature	−0.479**	−0.254**	0.000	−0.190**		−0.185**	−0.711**	0.121**
Humidity	0.073**	0.222**	0.211**	0.416**	−0.096*		−0.040	−0.395**
Pressure	0.314**	0.246**	−0.084**	0.072*	−0.734**	−0.190		−0.200**
Wind speed	0.291**	0.509**	−0.213**	−0.329**	0.267**	−0.276**	−0.336**

*P < 0.05. **P < 0.001. The summer months (May–September) are shown above the diagonal; the winter months (October–April) are shown below the diagonal.

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