Table 1.
Air pollution and meteorological data in Ningbo, China (2014–2016)
| Mean ± SD | Minimum | P25 | P50 | P75 | IQR | Maximum | |||
|---|---|---|---|---|---|---|---|---|---|
| ALL year | Cold Perioda | Warm Period | |||||||
| Air pollutants | |||||||||
| SO2 (μg/m3) | 16.56 ± 9.05 | 18.91 ± 10.25 | 14.25 ± 6.97 | 5.90 | 10.53 | 13.70 | 19.09 | 8.56 | 74.08 |
| NO2 (μg/m3) | 40.50 ± 16.88 | 49.85 ± 15.99 | 31.28 ± 11.94 | 5.59 | 28.00 | 37.38 | 51.34 | 23.34 | 115.00 |
| PM10 (μg/m3) | 69.69 ± 38.37 | 87.03 ± 41.75 | 52.60 ± 24.85 | 10.18 | 42.90 | 60.20 | 85.31 | 42.41 | 287.10 |
| PM2.5 (μg/m3) | 43.73 ± 26.26 | 55.64 ± 29.38 | 31.99 ± 15.55 | 4.24 | 25.50 | 37.38 | 54.11 | 28.62 | 196.93 |
| O3 (μg/m3) | 64.33 ± 29.71 | 53.46 ± 25.07 | 75.05 ± 30.05 | 8.17 | 42.99 | 61.96 | 83.02 | 40.03 | 244.30 |
| CO (mg/m3) | 1.06 ± 0.35 | 1.13 ± 0.39 | 0.99 ± 0.28 | 0.04 | 0.88 | 1.00 | 1.19 | 0.31 | 2.92 |
| Meteorology | |||||||||
| Temperature (°C) | 17.42 ± 8.10 | 10.64 ± 5.17 | 24.10 ± 3.76 | −4.47 | 10.23 | 18.69 | 23.94 | 13.71 | 32.25 |
| Relative Humidity (%) | 76.8 ± 11.80 | 74.29 ± 13.38 | 79.19 ± 9.33 | 32.96 | 69.82 | 77.81 | 85.47 | 15.65 | 97.60 |
PM2.5: particulate matter less than 2.5 μm in aerodynamic diameter, PM10: particulate matter less than 10 μm in aerodynamic diameter, SO2: sulfur dioxide, NO2: nitrogen dioxide, O3: Ozone, CO: carbon monoxide
aCold period was from November to April, and warm period was from May to October