A new exposure metric for traffic-related air pollution? An analysis of determinants of hopanes in settled indoor house dust

Table 3 City-specific determinants of hopane concentrations in house settled dust

City	Final model with regression coefficients	Partial R²	Model Adj.R²
Edmonton	log (hopanes) = 3 – 0.13 cleaning frequency	0.78	0.80
	- 1.5 Smooth Flooring	0.78
	−0.15 Air Conditioning	0.35
Toronto	Log (hopanes) = 2.69 -1.03 Smooth Flooring	0.29	0.45
	−0.008 Elevation	0.13
	+ 0.88 Attached Garage −0.66 Detached Garage	0.13%^*
Windsor^**	log (hopanes) = 5.6 + 0.5 elevation	0.36	0.39
Windsor^**	+ 0.17 RD1_100	0.13	0.39
Winnipeg	log (hopanes) = 1.45 – 0.057Heating degree days	0.17	0.33
Winnipeg	– 1.33 multifamily house	0.16	0.33
Vancouver	log (hopanes) = 1.9 – 0.09 Heating Degree Days	0.09	0.10
Vancouver	– 0.07 Shoe removal	0.07	0.10

^* The Garage variable has three categories: No garage, Attached garage and Detached garage.
^** In Windsor, elevation and distance to the Ambassador Bridge were strongly and significantly correlated. An alternative model with Distance to Ambassador Bridge yielded similar results, yet with smaller R²

ISSN: 1476-069X