Table 1 The statistical properties of air pollutants dataset.
N total | N missing | Mean | Standard deviation | Variance | Skewness | Kurtosis | Coefficient of variation | Median | Interquartile range (Q3–Q1) | Range (maximum–minimum) | Median absolute deviation | Robust coefficient of variation | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CO | 18,776 | 0 | 2929.229 | 2854.524 | 8148304.444 | 2.005 | 4.340 | 0.975 | 1842.500 | 2616.880 | 20888.330 | 974.660 | 0.784 |
NO | 18,776 | 0 | 33.661 | 62.127 | 3859.779 | 2.808 | 9.087 | 1.846 | 5.250 | 35.080 | 500.680 | 5.250 | 1.483 |
NO2 | 18,776 | 0 | 66.221 | 48.527 | 2354.917 | 2.034 | 6.487 | 0.733 | 54.150 | 49.700 | 456.340 | 23.300 | 0.638 |
O3 | 18,776 | 0 | 60.346 | 80.465 | 6474.605 | 1.997 | 5.744 | 1.333 | 27.180 | 92.640 | 801.090 | 27.180 | 1.483 |
SO2 | 18,776 | 0 | 66.694 | 49.439 | 2444.234 | 2.670 | 12.074 | 0.741 | 52.930 | 47.210 | 574.580 | 21.460 | 0.601 |
PM2.5 | 18,776 | 0 | 238.130 | 226.534 | 51317.483 | 1.949 | 4.456 | 0.951 | 157.445 | 228.560 | 1696.260 | 92.630 | 0.872 |
PM10 | 18,776 | 0 | 300.093 | 267.166 | 71377.579 | 1.868 | 4.023 | 0.890 | 209.705 | 269.205 | 1954.860 | 114.565 | 0.810 |
NH3 | 18,776 | 0 | 25.110 | 26.402 | 697.071 | 3.568 | 18.752 | 1.051 | 17.480 | 20.770 | 287.770 | 9.250 | 0.785 |
