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Table 4 Final model results for three pollutants

From: Land use regression modeling of intra-urban residential variability in multiple traffic-related air 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