Table 2.
Pollution regression with altitude, meteorological parameters, and distance from street.
| PM2.5 | Simple Reg |
Stepwise Reg |
MEP# |
|||||
|---|---|---|---|---|---|---|---|---|
| Coeff (Cons) | CI (95 %) | Forward stepwise reg (0.20) | Forward stepwise reg (0.10) | Backward stepwise reg (0.20) | Backward stepwise reg (0.10) | Forward stepwise reg (0.1) | ||
| Height (0–500m) | −0.11c (94.32) | −0.14 | −0.09 | – | – | – | – | 0.455a |
| Temperature | −2.28c (80.5) | −2.80 | −1.76 | 6.62a | 6.62a | – | – | – |
| Windspeed | −32.64c (131.54) | −40.33 | −24.95 | −38.36a | −38.36a | −21.99a | −21.99a | −34.30c |
| Relative humidity | −0.62c (82.93) | −0.81 | −0.42 | 1.22ns | 1.22ns | – | – | – |
| Distance from street | −0.02c (67.22) | −0.031 | −0.01 | – | – | – | – | – |
| – | – | – | – | R2 = 0.85 Adjust R2 = 0.75 RSME = 9.93 |
R2 = 0.85 Adjust R2 = 0.75 RSME = 9.93 |
R2 = 0.51 Adjust R2 = 0.43 RSME = 15.06 |
R2 = 0.51 Adjust R2 = 0.43 RSME = 15.06 |
R2 = 0.91 Adjust R2 = 0.89 RSME = 16.13 |
| PM10 |
Simple Reg | Stepwise Reg | ||||||
| Coeff (Cons) |
CI (95 %) |
Forward stepwise reg (0.20) |
Forward stepwise reg (0.10) |
Backward stepwise reg (0.20) |
Backward stepwise reg (0.10) |
|||
| Height (0–500m) | −0.007ns (106.04) | −0.06 | 0.05 | – | – | – | – | |
| Temperature | 3.75c (−38.66) | 2.19 | 5.32 | 5.48c | 3.75c | 5.48c | 3.75c | |
| Relative humidity | −1.38a (72.29) | −2.68 | −0.08 | 1.10ns | – | 1.10ns | – | |
| Distance from street | −1.13c (136.4) | −1.45 | −0.81 | – | – | – | – | |
| – | – | – | – | R2 = 0.77 Adjust R2 = 0.73 RSME = 1.61 |
R2 = 0.71 Adjust R2 = 0.69 RSME = 1.74 |
R2 = 0.77 Adjust R2 = 0.73 RSME = 1.61 |
R2 = 0.71 Adjust R2 = 0.69 RSME = 1.74 |
|
| NO2 |
Simple Reg | Stepwise Reg | ||||||
| Coeff (Cons) |
CI (95 %) |
Forward stepwise reg (0.20) |
Forward stepwise reg (0.10) |
Backward stepwise reg (0.20) |
Backward stepwise reg (0.10) |
|||
| Height (0–500m) | 0.13c (55.58) | 0.08 | 0.19 | – | – | – | – | |
| Temperature | 5.563ns (119.77) | −18.92 | 30.05 | −17.23a | −17.23a | – | – | |
| Windspeed | −1.684ns (35.13) | −7.89 | 4.52 | −19.14b | −19.14b | – | – | |
| Relative humidity | 2.32c (−21.03) | 1.59 | 3.06 | – | – | 2.32c | 2.32c | |
| Distance from street | −0.01c (63.77) | −0.02 | −0.01 | – | – | – | – | |
| – | – | – | – | R2 = 0.91 Adjust R2 = 0.88 RSME = 14.3 |
R2 = 0.91 Adjust R2 = 0.88 RSME = 14.3 |
R2 = 0.86 Adjust R2 = 0.85 RSME = 16.22 |
R2 = 0.86 Adjust R2 = 0.85 RSME = 16.22 |
|
| NOX |
Simple Reg | Stepwise Reg | MEP# | |||||
| Coeff (Cons) |
CI (95 %) |
Forward stepwise reg (0.20) |
Forward stepwise reg (0.10) |
Backward stepwise reg (0.20) |
Backward stepwise reg (0.10) |
Forward stepwise reg (0.20) |
||
| Height (0–500m) | −0.11c (71.25) | −0.14 | −0.08 | – | – | – | – | – |
| Temperature | −7.32ns (274.92) | −24.45 | 9.80 | – | – | – | – | – |
| Windspeed | −25.21ns (174.47) | −96.49 | 46.05 | – | – | – | – | −43.39ns |
| Relative humidity | 2.14ns (26.7) | −1.16 | 5.45 | 2.10ns | 2.10ns | 2.10ns | 2.10ns | 2.88ns |
| Distance from street | −0.01ns (75.76) | −0.03 | 0.002 | – | – | – | – | – |
| – | – | – | – | R2 = 0.77 Adjust R2 = 0.68 RSME = 27.70 |
R2 = 0.77 Adjust R2 = 0.68 RSME = 27.70 |
R2 = 0.77 Adjust R2 = 0.68 RSME = 27.70 |
R2 = 0.77 Adjust R2 = 0.68 RSME = 27.70 |
R2 = 0.58 Adjust R2 = 0.42 RSME = 37.57 |
ns: P > 0.05.
MER#: Meteorological parameters (height, temperature, windspeed, and relative humidity).
a
P ≤ 0.05.
b
P ≤ 0.01.
c
P ≤ 0.001.