Supplementary material to "Measurement Report: Quantitative Analysis of Aerosol Acidity and Its Driving Factors in Guanzhong Area, Northwest China"

Table.S1 The numbers of PM2.5, PM10 and O3 pollution days in different seasons Winter Spring Summer Autumn PM2.5(μg/m 3 ) 67 17 2 10 PM10(μg/m 3 ) 44 7 0 9 O3 (μg/m 3 ) 0 7 33 3The daily averaged concentrations value exceeding national air quality standards of China Table S2 Results of T-test and F-test Winter Model T-test F-test Model Summary Non-standardized coefficient T F Sig. R R 2 Estimated standard error Constant 1.204 3.029 295.93 P < 0.01 0.88 0.77 0.082 SO4 2- -0.003 -5.531 NO3 - 0.006 15.476 K + 0.023 4.297 Mg 2+ 0.328 3.134 Ca 2+ -0.017 -1.578 T -0.004 -2.581 RH 0.001 0.060 Spring Model T-test F-test Model Summary Constant 0.533 2.835 219.02P < 0.01 0.83 0.69 0.044 SO4 2- 0.006 12.774 NO3 - 0.005 15.513 K + -0.018 -2.745 Mg 2+ -0.065 -0.898 Ca 2+ -0.017 -3.375 T -0.001 -2.018 RH -0.009 -0.581 Summer Model T-test F-test Model Summary Constant -1.389 -9.369