Table 1.
Descriptive statistics of the data: air pollution and daily deaths in Boston, 2000–2009.
| Variable | Mean ± SD | Min | Max |
|---|---|---|---|
| Daily deathsa | 55.8 ± 9.5 | 27 | 94 |
| PM2.5 (μg/m3)b | 9.8 ± 5.8 | 0.2 | 67.2 |
| BC (μg/m3)b | 0.70 ± 0.41 | 0.10 | 4.70 |
| NO2 (ppb)c | 18.4 ± 6.4 | 4.0 | 46.9 |
| PBL (m)d | 770 ± 356 | 110 | 2,392 |
| Temperature (°C)e | 10.8 ± 9.4 | –16.9 | 31.5 |
| Wind speed (knots)e | 9.6 ± 3.2 | 2.5 | 26 |
| Abbreviations: max, maximum; min, minimum. aData from MA Department of Public Health. bData measured at Harvard Supersite. cData from MA Department of Environmental Protection. dData from NOAA North America Reanalysis data set (NOAA 2010). eData from National Climatic Data Center. | |||