Main Factors Influencing Winter Visibility at the Xinjin Flight College of the Civil Aviation Flight University of China

Table 2

Quantitative relationships between visibility and PM_2.5 concentration under different relative humidity conditions. Note: indicates that the significance level of a = 0.01 has been passed.

Relative humidity	Quantitative relationship	R^2	Correlation coefficient
RH < 60%	VIS = 56990PM2.5^−0.472	0.341	−0.583
60% ≦ RH < 70%	VIS = 47354 PM2.5^−0.445	0.333	−0.574
70% ≦ RH < 80%	VIS = 102894 PM2.5^−0.674	0.570	−0.755
80% ≦ RH < 90%	VIS = 78532 PM2.5^−0.698	0.451	−0.670