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

Adamkiewicz, Gary; Hsu, Hsiao-Hsien; Vallarino, Jose; Melly, Steven J; Spengler, John D; Levy, Jonathan I

doi:10.1186/1476-069X-9-73

Environmental Health

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

*Retained for multivariate model development, based on (session-corrected) univariate and bivariate analyses

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ISSN: 1476-069X

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