## 3 Results and Discussion
### Aerosol Concentration Distributions
The MAD and IQR values of AD cases were the largest in all the channels, and the variability was especially evident in the 4 th and 5 th channels. In particular, the MAD of the 5 th channel was approximately 13 times higher than that of the other channels on average. This shows that the mass concentration in the coarse particle mode increases rapidly when Asian dust occurs compared to that for other phenomena. Excluding AD, the MAD and IQR values of the first channel were the highest. This implied that the aerosol concentration in the 0.3 to 0.5 section was the farthest from the median value--i.e., the channel with the largest increase in aerosol concentration was channel 1 during each phenomenon. The MAD values for all phenomena of the 2 nd and 3 rd channels showed low variability with low values of \(\leq\)0.2, but the 1 st channel showed high variability of \(\geq\)0.5. Skewness and kurtosis before logarithmic transformation showed that most of the variables do not follow the normal distribution (Table 3). Therefore, the skewness and kurtosis were calculated by converting a wide range of mass concentration values into their logarithmic forms based on the aerosol distribution characteristics. The skewness ranged from \(-\)1.58 to 1.84 and the kurtosis ranged from \(-\)1.49 to 6.86, which are consistent with the normality criteria presented by [PERSON] et al. [36]. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Case**} & **Particle** & \multirow{2}{*}{**Mean**} & **Standard** & **25 Percentile** & **Median** & **75** & \multirow{2}{*}{**IQR**} & **MAD** \\  & **Size** & & **Deviation** & **(Q1)** & **(Q2)** & **Percentile (Q3)** & & \\ \hline \multirow{8}{*}{AD} & 0.3–0.5 & 1.1755 & 0.7010 & 0.5318 & 1.1688 & 1.6243 & 1.0925 & 0.6083 \\  & 0.5–1.0 & 0.4099 & 0.8050 & 0.0959 & 0.1366 & 0.2164 & 0.1205 & 0.0439 \\  & 1.0–3.0 & 0.3858 & 0.9789 & 0.0809 & 0.1235 & 0.2150 & 0.1341 & 0.0458 \\  & 3.0–5.0 & 1.7291 & 3.6500 & 0.4868 & 0.7222 & 1.3265 & 0.8397 & 0.3217 \\  & 5.0–10 & 2.2100 & 5.1697 & 0.0855 & 1.0283 & 1.9761 & 1.8906 & 0.9436 \\ \hline \multirow{8}{*}{HZ} & 0.3–0.5 & 1.5776 & 0.9411 & 0.9442 & 1.2561 & 2.4267 & 1.4825 & 0.5105 \\  & 0.5–1.0 & 0.1894 & 0.1098 & 0.0791 & 0.1915 & 0.2808 & 0.2017 & 0.1061 \\  & 1.0–3.0 & 0.0494 & 0.0271 & 0.0272 & 0.0405 & 0.0646 & 0.0374 & 0.0185 \\  & 3.0–5.0 & 0.3000 & 0.3056 & 0.1072 & 0.1893 & 0.3524 & 0.2452 & 0.1131 \\  & 5.0–10 & 0.3171 & 0.3680 & 0.0558 & 0.1575 & 0.4783 & 0.4225 & 0.1179 \\ \hline \multirow{8}{*}{MI} & 0.3–0.5 & 2.2309 & 1.2751 & 1.0858 & 2.2125 & 3.0921 & 2.0063 & 0.9497 \\  & 0.5–1.0 & 0.1141 & 0.0818 & 0.0639 & 0.0932 & 0.1180 & 0.0541 & 0.0283 \\  & 1.0–3.0 & 0.0314 & 0.0265 & 0.0088 & 0.0259 & 0.0460 & 0.0372 & 0.0177 \\  & 3.0–5.0 & 0.2475 & 0.4472 & 0.0685 & 0.1134 & 0.2332 & 0.1647 & 0.0614 \\  & 5.0–10 & 0.2828 & 0.3416 & 0.0585 & 0.1748 & 0.3382 & 0.2797 & 0.1224 \\ \hline \multirow{8}{*}{PR} & 0.3–0.5 & 1.1178 & 1.1702 & 0.2327 & 0.6258 & 1.5017 & 1.2691 & 0.5244 \\  & 0.5–1.0 & 0.0627 & 0.0388 & 0.0354 & 0.0549 & 0.0790 & 0.0436 & 0.0213 \\ \cline{1-1}  & 1.0–3.0 & 0.0282 & 0.0303 & 0.0119 & 0.0213 & 0.0343 & 0.0224 & 0.0123 \\ \cline{1-1}  & 3.0–5.0 & 0.1779 & 0.3571 & 0.0355 & 0.0791 & 0.1843 & 0.1488 & 0.0590 \\ \cline{1-1}  & 5.0–10 & 0.2441 & 0.7849 & 0.0167 & 0.0395 & 0.1973 & 0.1806 & 0.0349 \\ \hline \multirow{8}{*}{CD} & 0.3–0.5 & 1.0887 & 0.9387 & 0.3165 & 0.8278 & 1.5963 & 1.2798 & 0.5654 \\ \cline{1-1}  & 0.5–1.0 & 0.0822 & 0.0674 & 0.0368 & 0.0550 & 0.1054 & 0.0686 & 0.0232 \\ \cline{1-1}  & 1.0–3.0 & 0.0333 & 0.0292 & 0.0142 & 0.0255 & 0.0424 & 0.0282 & 0.0136 \\ \cline{1-1}  & 3.0–5.0 & 0.3264 & 0.4135 & 0.0939 & 0.1620 & 0.3870 & 0.2931 & 0.0999 \\ \cline{1-1}  & 5.0–10 & 0.3684 & 0.5944 & 0.0402 & 0.1168 & 0.4963 & 0.4561 & 0.0967 \\ \hline \hline \end{tabular} IQR: interquartile range, MAD: median absolute deviation, AD: Asian dust, HZ: haze, MI: mist, PR: precipitation, and CD: clear days.  
\end{table}