Table 4.
Medians and 95% HPD intervals of posterior distributions from models of monthly means of particulate matter pollutants.
| PM10 | PM2.5 | |
|---|---|---|
| Month intercepts (μg/m³) | ||
| January | 65.69 (26.16, 136.98) | 60.28 (20.52, 132.96) |
| February | 52.57 (21.20, 106.33) | 44.84 (15.98, 95.07) |
| March | 63.38 (27.48, 116.50) | 57.37 (23.88, 109.10) |
| April | 66.83 (30.21, 116.49) | 69.61 (31.51, 123.48) |
| May | 83.60 (36.64, 145.90) | 93.86 (40.65, 167.06) |
| June | 88.18 (35.63, 158.04) | 106.64 (40.72, 199.27) |
| July | 90.04 (31.87, 168.05) | 107.34 (33.93, 218.22) |
| August | 91.20 (32.57, 170.06) | 107.37 (34.28, 217.05) |
| September | 75.56 (30.68, 135.92) | 86.99 (33.60, 162.26) |
| October | 79.34 (35.45, 138.56) | 82.90 (36.95, 146.81) |
| November | 77.35 (33.95, 139.55) | 75.74 (32.37, 140.85) |
| December | 66.15 (25.18, 142.37) | 61.59 (19.71, 142.18) |
| Covariate coefficients (ratios) | ||
| Time trend (per month) | 1.00 (0.98, 1.02) | 0.99 (0.97, 1.01) |
| Longitudinal trend (linear term) | 1.13 (0.62, 1.76) | 0.96 (0.51, 1.56) |
| Latitudinal trend (linear term) | 1.00 (0.78, 1.25) | 1.03 (0.79, 1.30) |
| Longitudinal trend (quadratic term) | 1.55 (0.94, 2.25) | 1.58 (0.93, 2.33) |
| Latitudinal trend (quadratic term) | 1.07 (0.86, 1.31) | 0.87 (0.69, 1.08) |
| Urban | 0.85 (0.74, 0.98) | 0.92 (0.80, 1.06) |
| Elevation (per 10m) | 0.96 (0.73, 1.21) | 0.85 (0.65, 1.10) |
| Distance from road (per 0.01) | 0.77 (0.40, 1.28) | 0.53 (0.27, 0.90) |
| Distance from motorway (per 0.01) | 1.12 (0.98, 1.26) | 1.02 (0.89, 1.16) |
| Length of roads and motorways in vicinity (per 1 km) | 1.01 (0.98, 1.04) | 1.00 (0.97, 1.03) |
| Coefficients in error models (ratios) | ||
| Temperature (per 10C) | 0.71 (0.50, 0.90) | 0.59 (0.31, 0.90) |
| Wind speed (per 1 SD of log (wind speed)) | 0.94 (0.91, 0.97) | 0.97 (0.94, 1.00) |
| Humidity (per 5%) | 0.89 (0.87, 0.91) | 0.97 (0.92, 1.01) |
| Precipitation (per 10 mm) | 1.02 (0.90, 1.17) | 0.97 (0.79, 1.16) |
| Hyperparameters | ||
| SD of Gaussian observations (on log scale) | 0.03 (0.02, 0.04) | 0.04 (0.03, 0.05) |
| Range of the SPDE model (km) | 42.36 (31.64, 51.60) | 44.90 (28.53, 62.64) |
| SD of the SPDE model (on log scale) | 0.21 (0.17, 0.25) | 0.25 (0.18, 0.33) |
| Coefficient of AR model | 0.80 (0.72, 0.86) | 0.82 (0.68, 0.91) |