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Definition
 
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Census Tract Definition: Relatively permanent statistical subdivisions of a county used by the U.S. Bureau of the Census for purposes of population enumeration. Each tract has a unique identification number consisting of a 4-digit basic number and a 2-digit suffix of the form 1234.56.
census tract Definition: A geographic sub-unit delineated for demographic purposes.
 
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However, for workers within the same census tract, variations were observed in the partial exposure estimates associated with time spent outside the residential census tract.

Eleanor M Setton et al.

International Journal of Health Geographics 7 (7), 18 Jul 2008

Simulation modeling shows that some workers may have exposures 1.3 times higher than other workers residing in the same census tract because of time spent away from the residential census tract, and that time spent in work census tracts contributes most to the differences in exposure.

Eleanor M Setton et al.

International Journal of Health Geographics 7 (7), 18 Jul 2008

The results suggest that while time spent in the home indoor microenvironment contributes most to between-census tract variation in estimates of annual average exposures to traffic-related NO 2 , time spent in the work indoor microenvironment contributes most to within-census tract variation, and time spent in transit by vehicle makes a negligible contribution.

Eleanor M Setton et al.

International Journal of Health Geographics 7 (7), 18 Jul 2008

In the SESM, this same pool of time-activity patterns is used for the simulation in each census tract, thus controlling for variation due to demographic differences.

Eleanor M Setton et al.

International Journal of Health Geographics 7 (7), 18 Jul 2008

2) Work flow data for all people aged 15 and over reporting employment, based on a 20 percent sample in each census tract on May 15 th , 2001, were purchased from Statistics Canada.

Eleanor M Setton et al.

International Journal of Health Geographics 7 (7), 18 Jul 2008

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