*3.3. Relation between PM Concentration, Meteorological Factors, and Air Pollutants by Season*

The PM concentration levels are affected by meteorological factors and the amount of emitted air pollutants. In this study, we considered the meteorological factors and air pollutants as factors affecting the PM concentration. Table 1 shows the correlation coefficients between the PM, meteorological factors, and air pollutants. In spring, PM levels shows positive correlation with humidity, NO2, and CO, while negative correlation was shown with wind speed and O3. In summer, PM levels were positively correlated with the amount of SO<sup>2</sup> and negatively correlated with the temperature. In the case of fall, correlation between the PM and meteorological factors was the same as in spring, and PM was positively correlated with NO2, CO, and SO2.

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**Table 1.** Seasonal correlation coefficients between PM concentration, meteorological factors, and other air pollutants.

Note: \* *p* < 0.05, \*\* *p* < 0.01, \*\*\* *p* < 0.001.
