Table 2.
Descriptive analysis of variables
| Variables | Obs | Mean | Sd | Min | Q1 | Q2 | Q3 | Max |
|---|---|---|---|---|---|---|---|---|
| conf | 840 | 4966.307 | 14000 | 2.000 | 166.000 | 362.000 | 559.500 | 50000 |
| NO2 | 840 | 30.218 | 13.940 | 5.000 | 20.000 | 28.000 | 38.000 | 98.000 |
| PM2.5 | 840 | 33.935 | 21.178 | 3.000 | 21.000 | 30.000 | 43.000 | 207.000 |
| PM10 | 840 | 51.094 | 25.727 | 6.000 | 32.500 | 47.000 | 65.500 | 154.000 |
| SO2 | 840 | 6.116 | 2.291 | 2.000 | 5.000 | 6.000 | 7.000 | 17.000 |
| temp | 840 | 13.703 | 5.759 | -4.500 | 10.000 | 13.750 | 18.000 | 27.500 |
Obs is the observed value, Mean is the average, Sd is the standard deviation, Min is the minimum, Q1 is the first quartile, Q2 is the median, Q3 is the third quartile, and Max is the maximum