01515230

Component

https://doi.org/10.3141/2452-13

Vehicular traffic is a major source of ambient air pollution in urban areas. Traffic-related air pollutants, including carbon monoxide, nitrogen oxides, particulate matter less than 2.5 µm in diameter, and diesel exhaust emissions, have been associated with adverse human health effects, especially in areas near major roads. In addition to emissions from vehicles, ambient concentrations of air pollutants include contributions from stationary sources and background (or regional) sources. Although dispersion models have been widely used to evaluate air quality strategies and policies and can represent the spatial and temporal variation in environments near roads, the use of these models in health studies to estimate air pollutant exposures has been relatively limited. This paper summarizes the modeling system used to estimate exposures in the Near-Roadway Exposure and Urban Air Pollutant Study, an epidemiological study that examined 139 children with asthma or symptoms consistent with asthma, most of whom lived near major roads in Detroit, Michigan. Air pollutant concentrations were estimated with a hybrid modeling framework that included detailed inventories of mobile and stationary sources on local and regional scales; the RLINE, AERMOD, and CMAQ dispersion models; and monitored observations of pollutant concentrations. The temporal and spatial variability in emissions and exposures over the 2.5-year study period and at more than 300 home and school locations was characterized. The paper highlights issues with the development and understanding of the significance of traffic-related exposures through the use of dispersion models in urban-scale exposure assessments and epidemiology studies.

01556363

14-1669

English

0000-0002-6836-6944

pp 105–113

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295390

Print

Figures (7) ; Maps; References (28) ; Tables (2)

Air pollution; Children; Diseases and medical conditions; Environmental impacts; Epidemiology; Health; Mathematical models; Mobile sources; Respiratory system; Stationary sources; Urban areas

Exposure (Pollutants)

Detroit (Michigan)

Environment; Highways; Society; I15: Environment; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Jan 27 2014 2:36PM

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