Table 4 Final model results for three pollutants
ln(PM2.5) (μg/m3) | ln(EC) (m-1*10-5) | NO2 (ppb) | |||||||
|---|---|---|---|---|---|---|---|---|---|
Predictor Type | Model | β (p-value) | Sequential R2 | Model | β (p-value) | Sequential R2 | Model | β (p-value) | Sequential R2 |
Intercept | 0.205 (.32) | -- | -0.907 (<.0001) | -- | -12.50 (.009) | -- | |||
Central site Concentration | ln (Central Site [PM2.5]) | 0.776 (<.0001) | .68 | ln (Central site [EC]) | 0.103 (.59) | .03 | Central site [NO2] | 1.06 (<.0001) | .21 |
ln (Central site [EC]) * warmer season | 0.82 (.004) | .26 | |||||||
Traffic Indicator | Roadway Length in 100 m | 1.48*10-4 (.02) | .70 | Roadway Length in 200 m | 1.10 * 10-4 (.01) | .40 | Roadway Length in 50 m | 0.0144 (.002) | .22 |
Traffic Indicator* Modifier | N/A | N/A | N/A | Roadway Length in 200 m × % Hours of Still Winds | 4.38 *10-4 (.02) | .48 | Roadway Length in 50 m × Obstructed Major Rd | -0.0094 (.005) | .31 |
Other Sources/Land Use | Smoking or grilling | 0.156 (.01) | .73 | Warmer Season | -0.268 (.057) | .52 | Warmer Season | 4.93 (.001) | .44 |
Population Density | 9.24*10-6 (.01) | .76 | Population Density | 4.01*10-4 (.001) | .56 | ||||