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Table 4 Associations between GIS variables and NO2 concentrations in models correcting for sampling session

From: Nitrogen dioxide concentrations in neighborhoods adjacent to a commercial airport: a land use regression modeling study

Variable/Type Estimate Standard Error t Value P value
DISTANCE TO NEAREST FUNCTION CLASS (RI DOT)
Distance to nearest Class 1 Road* (ppb/m) -0.00236 0.000270 -8.75 < .0001
Distance to nearest Class 2 Road* (ppb/m) -0.00296 0.000353 -8.38 < .0001
Distance to nearest Class 3 Road* (ppb/m) -0.00477 0.000450 -10.61 < .0001
Distance to nearest Class 4 Road (ppb/m) -0.00330 0.00178 -1.86 0.0639
TRAFFIC DENSITY WITHIN VARIOUS RADII
Traffic Density within 100 m* (ppb-day-km 2 /(vehicle-m)) 0.0155 0.00183 8.47 < .0001
Traffic Density within 200 m* (ppb-day-km 2 /(vehicle-m)) 0.0235 0.00273 8.61 < .0001
Traffic Density within 300 m* (ppb-day-km 2 /(vehicle-m)) 0.0327 0.00353 9.25 < .0001
Traffic Density within 400 m* (ppb-day-km 2 /(vehicle-m)) 0.0427 0.00423 10.11 < .0001
DISTANCE TO AIRPORT-RELATED LOCATIONS
Airport Terminal* (ppb/m) - 0.00178 0.000289 - 6.15 < 0.0001
Runway 16/34 (ppb/m) 0.000331 0.000268 1.24 0.217
Runway 5/23 (ppb/m) 0.00138 0.000435 3.17 0.0016
Airport Centroid (ppb/m) 0.000344 0.000368 0.94 0.35
Airport Fence (ppb/m) - 0.000379 0.000571 - 0.66 0.51
TRAFFIC-RELATED VARIABLES
ADT-weighted road length within 100 m* (ppb-day/vehicle-m) 0.00000056 0.00000007 8.06 < 0.0001
ADT-weighted road length within 200 m* (ppb-day/vehicle-m) 0.00000024 0.00000003 8.64 < 0.0001
Length of Class 1 roads within 100 m* (ppb/m) 0.0325 0.00473 6.86 < 0.0001
Length of Class 1 roads within 200 m* (ppb/m) 0.0102 0.00169 6.05 < 0.0001
Length of Class 2 roads within 100 m*(ppb/m) 0.0169 0.00242 6.97 < 0.0001
Length of Class 2 roads within 200 m*(ppb/m) 0.00726 0.000934 7.78 < 0.0001
Length of Class 3 roads within 100 m*(ppb/m) 0.0159 0.00201 7.92 < 0.0001
Length of Class 3 roads within 200 m*(ppb/m) 0.00722 0.00081 8.95 < 0.0001
Length of Class 4 roads within 100 m (ppb/m) - 0.000924 0.000716 - 1.29 0.20
Length of Class 4 roads within 200 m (ppb/m) - 0.000411 0.000232 - 1.77 0.08
Length of all roads within 100 m*(ppb/m) 0.00297 0.000705 4.22 < 0.0001
Length of all roads within 200 m* (ppb/m) 0.000649 0.000220 2.95 0.0032
  1. *Retained for multivariate model development, based on (session-corrected) univariate and bivariate analyses