Distribution of air pollution concentrations and meteorological parameters
| Variables | Mean | SD | Minimum | Q1 | Median | Q3 | Maximum |
|---|---|---|---|---|---|---|---|
| Q1, first quartile value; Q3, third quartile value. | |||||||
| *From 1994 to 2004. | |||||||
| SO2, μg/m3 | 6.9 | 7.5 | 0 | 2 | 4 | 9 | 65 |
| NOx, μg/m3 | 39.6 | 14.3 | 6 | 30 | 39 | 48 | 126 |
| O3, μg/m3 | 29.9 | 21.5 | 0 | 12 | 26 | 44 | 115 |
| CO, μg/m3 | 683.5 | 468.8 | 0 | 376 | 590 | 889 | 4014 |
| PM10, μg/m3* | 21.1 | 11.3 | 2 | 13 | 19 | 27 | 103 |
| Minimum temperature, °C | 6.9 | 6.4 | –14.5 | 2 | 7.1 | 11.9 | 23.1 |
| Maximum temperature, °C | 16 | 8.5 | –6.7 | 9.6 | 15.9 | 22.5 | 39.3 |
| Maximum humidity, % | 93.6 | 6.8 | 51 | 91 | 96 | 98 | 100 |
| Minimum humidity, % | 55.9 | 18.7 | 12 | 41 | 54 | 70 | 100 |