Table 2 Distribution of annual PM2.5 and its components in the Normative Aging Study, 2000–2013
Particles | Min | Mean (SD) | Median (Q1, Q3) | Max | IQR |
|---|---|---|---|---|---|
PM2.5 (µg/m3) | 4.16 | 9.75 (1.80) | 9.78 (8.60, 11.00) | 16.02 | 2.39 |
EC (µg/m3) | 0.18 | 0.48 (0.12) | 0.47 (0.41, 0.53) | 1.19 | 0.12 |
OC (µg/m3) | 0.86 | 1.89 (0.41) | 1.82 (1.59, 2.16) | 3.61 | 0.57 |
NO3− (µg/m3) | 0.23 | 0.89 (0.22) | 0.88 (0.72, 1.04) | 1.53 | 0.32 |
SO42− (µg/m3) | 0.81 | 2.97 (0.90) | 3.06 (2.63, 3.24) | 6.29 | 0.61 |
Br (ng/m3) | 1.58 | 2.69 (0.31) | 2.70 (2.52, 2.90) | 3.60 | 0.38 |
Ca (ng/m3) | 11.82 | 24.60 (4.87) | 24.09 (21.52, 26.80) | 46.25 | 5.29 |
Cu (ng/m3) | 0.49 | 2.58 (0.98) | 2.60 (1.86, 3.19) | 6.97 | 1.33 |
Fe (ng/m3) | 15.28 | 50.84 (15.60) | 51.65 (39.70, 61.03) | 111.47 | 21.34 |
K (ng/m3) | 30.70 | 47.69 (3.71) | 47.32 (45.44, 49.89) | 66.75 | 4.45 |
Ni (ng/m3) | 0.06 | 1.39 (0.61) | 1.32 (0.90, 1.79) | 3.43 | 0.89 |
Pb (ng/m3) | 1.09 | 3.22 (1.09) | 3.32 (2.25, 4.01) | 5.45 | 1.76 |
Si (ng/m3) | 27.59 | 64.64 (19.47) | 63.92 (47.17, 80.40) | 113.92 | 33.23 |
V (ng/m3) | 0.19 | 2.54 (1.18) | 2.61 (1.70, 3.32) | 7.44 | 1.62 |
Zn (ng/m3) | 3.21 | 10.27 (2.54) | 10.10 (8.54, 12.34) | 18.22 | 3.80 |
Temperature (°C) | 0.04 | 10.31 (2.77) | 11.02 (9.27, 12.18) | 21.62 | 2.91 |
Relative humidity (%) | 32.89 | 62.17 (9.02) | 66.17 (56.39, 68.71) | 81.72 | 12.32 |