Table 1.
Summary statistics for PM 10 , spatially resolved PM 10 , SO 2 , NO 2 , daily mean temperature, daily mean relative humidity and daily IHD death counts in Beijing between 2008 and 2009
| Season | Min | 25% | Median | 75% | Max | Mean | SD | |
|---|---|---|---|---|---|---|---|---|
| PM10(μg/m3)*a | Spring | 7.0 | 80.0 | 124.0 | 184.0 | 600.0 | 144.5 | 96.3 |
| Summer | 5.0 | 64.0 | 98.0 | 134.0 | 463.2 | 101.4 | 52.2 | |
| Autumn | 7.0 | 54.0 | 94.0 | 148.0 | 553.0 | 110.1 | 75.9 | |
| Winter | 7.0 | 62.0 | 108.0 | 170.0 | 600.0 | 127.7 | 88.7 | |
| Overall | 5.0 | 64.0 | 104.0 | 150.0 | 600.0 | 120.8 | 81.6 | |
| Spatially resolved PM10(μg/m3)b | Spring | 13.1 | 84.9 | 125.4 | 186.7 | 593.1 | 147.6 | 93.4 |
| Summer | 17.3 | 69.0 | 98.8 | 1338 | 432.0 | 103.7 | 50.4 | |
| Autumn | 11.3 | 61.3 | 99.1 | 150.8 | 489.9 | 114.9 | 75.1 | |
| Winter | 13.2 | 61.6 | 96.9 | 144.4 | 600.0 | 114.9 | 78.8 | |
| Overall | 11.3 | 68.0 | 104.2 | 150.7 | 600.0 | 120.3 | 78.1 | |
| SO2(μg/m3) | Spring | 6 | 14.0 | 25.0 | 39.8 | 138 | 30.7 | 22.7 |
| Summer | 6 | 8.0 | 11.0 | 14.0 | 44 | 12.5 | 6.7 | |
| Autumn | 6 | 12.0 | 16.0 | 29.0 | 136 | 24.9 | 21.8 | |
| Winter | 10 | 39.3 | 72.0 | 102.0 | 202 | 75.7 | 42.3 | |
| Overall | 6 | 12.0 | 21.0 | 46.0 | 202 | 36.0 | 35.6 | |
| NO2(μg/m3) | Spring | 16 | 41.6 | 49.6 | 59.2 | 152 | 51.6 | 18.4 |
| Summer | 14.4 | 28.8 | 40.0 | 44.8 | 62.4 | 37.9 | 11.0 | |
| Autumn | 19.2 | 40.0 | 52.8 | 67.2 | 142.4 | 58.2 | 26.6 | |
| Winter | 9.6 | 40.0 | 59.2 | 80.6 | 140.8 | 60.6 | 25.9 | |
| Overall | 9.6 | 36.8 | 48.0 | 60.8 | 152 | 52.2 | 23.2 | |
| T(°C) | Spring | -0.1 | 10.0 | 15.6 | 20.6 | 26.8 | 15.2 | 6.5 |
| Summer | 17.5 | 24.3 | 26.0 | 28.0 | 31.6 | 26.0 | 2.7 | |
| Autumn | -2 | 7.1 | 15.1 | 19.9 | 25.4 | 13.4 | 7.6 | |
| Winter | -9.4 | -3.5 | -1.5 | 0.5 | 9.4 | -1.3 | 3.4 | |
| Overall | -9.4 | 2.3 | 15.4 | 23.55 | 31.6 | 13.4 | 11.1 | |
| RH(%) | Spring | 15 | 30.0 | 44.0 | 56.0 | 95 | 44.8 | 18.2 |
| Summer | 19 | 57.0 | 68.0 | 76.0 | 90 | 64.8 | 15.5 | |
| Autumn | 19 | 44.0 | 60.5 | 71.0 | 88 | 57.2 | 18.0 | |
| Winter | 11 | 24.0 | 38.0 | 53.0 | 82 | 39.8 | 17.4 | |
| Overall | 11 | 35 | 53 | 68 | 95 | 51.7 | 19.9 | |
| IHD(N) | Spring | 20 | 32.8 | 37 | 42 | 57 | 37.3 | 7.3 |
| Summer | 19 | 28 | 32 | 37 | 49 | 32.5 | 6.4 | |
| Autumn | 18 | 34 | 40 | 46 | 67 | 41.0 | 9.8 | |
| Winter | 29 | 43 | 49 | 55 | 75 | 49.1 | 8.4 | |
| Overall | 18 | 33 | 39 | 46 | 75 | 39.9 | 10.1 |
Note: PM10: Particulate matter with an aerodynamic diameter of <10 μm; SO2: sulfur dioxide; NO2: nitrogen dioxide; T: Temperature; RH: Relative humidity; IHD: Ischemic heart disease; N: Number of death.
*The maximum limit of detection for PM10 concentration is 600 μg/m3.
aRepresenting the average of the 27 monitoring stations.
bRepresenting the average of the 287 townships where health data was available.