Table 2. Spearman correlation coefficients between daily air pollutant concentrations and weather conditions in Beijing (2009∼2010).

	NO2	PM10	Temperature	Humidity	Barometricpressure
CO	0.86*	0.58*	−0.33*	0.35*	0.10*
NO2		0.55*	−0.23*	0.27*	0.05*
PM10			−0.02	0.22*	−0.19*
Temperature				0.33*	−0.83*
Humidity					−0.31*

^* P<0.05.