|
Final model results for three pollutants |
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| 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 |
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| 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 |
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Clougherty et al. Environmental Health 2008 7:17 doi:10.1186/1476-069X-7-17 |
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