Table 3.
Distributions of air pollution, temperature, and relative humidity for all NAS visits, January 2003 – December 2011
| Exposure (unit) | Exposure window (days) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 7 | 14 | 21 | 28 | |||||||
| Mean (SD) | IQR | Mean (SD) | IQR | Mean (SD) | IQR | Mean (SD) | IQR | Mean (SD) | IQR | ||
| Air pollution | PM2.5 (μg/m3) | 10.16 (6.58) | 6.58 | 9.96 (3.62) | 4.18 | 9.94 (3.13) | 3.66 | 9.95 (3.13) | 3.66 | 10.00 (2.77) | 3.23 |
| Black carbon (μg/m3) | 0.75 (0.43) | 0.52 | 0.74 (0.23) | 0.33 | 0.73 (0.19) | 0.30 | 0.74 (0.18) | 0.26 | 0.74 (0.18) | 0.28 | |
| Particle number (counts/cm3, ×104) | 2.37 (1.27) | 1.82 | 2.31 (1.07) | 1.55 | 2.31 (1.05) | 1.49 | 2.31 (1.03) | 1.39 | 2.29 (1.02) | 1.39 | |
| CO (ppm, ×10−1) | 4.14 (2.49) | 2.88 | 4.19 (2.11) | 2.92 | 4.17 (2.03) | 2.76 | 4.17 (2.00) | 2.67 | 4.18 (1.98) | 2.65 | |
| NO2 (ppm, ×10−2) | 1.90 (0.65) | 0.81 | 1.91 (0.42) | 0.59 | 1.91 (0.39) | 0.58 | 1.91 (0.37) | 0.56 | 1.91 (0.36) | 0.56 | |
| O3 (ppm, ×10−2) | 2.38 (1.16) | 1.64 | 2.41 (0.85) | 1.31 | 2.42 (0.77) | 1.25 | 2.43 (0.74) | 1.22 | 2.45 (0.72) | 1.19 | |
| SO2 (ppm, ×10−3) | 4.13 (3.10) | 3.19 | 4.08 (2.39) | 2.97 | 4.08 (2.33) | 2.97 | 4.08 (2.14) | 2.87 | 4.07 (2.28) | 3.03 | |
| Temperature (°C) | 12.52 (8.63) | 13.55 | 12.60 (8.04) | 13.39 | 12.56 (7.94) | 13.30 | 11.89 (8.36) | 13.91 | 12.58 (7.91) | 13.58 | |
| Relative humidity (%) | 68.58 (15.60) | 23.98 | 68.41 (8.91) | 12.51 | 68.22 (6.49) | 9.24 | 67.26 (6.69) | 8.80 | 68.27 (5.94) | 8.11 | |
SD = standard deviation; IQR = interquartile range