Presentation Abstract

Session: Indoor-Outdoor Connections
Wednesday, Jun 08, 2011, 9:55 AM -12:00 PM
Presentation: 592 - Automobile Proximity And Indoor Residential Concentrations Of Btex And Mtbe
Pres. Time: Wednesday, Jun 08, 2011, 9:55 AM -12:00 PM
Location: 15
Keyword 1: Attached garages
Keyword 2: Benzene
Keyword 3: Exposure
Author(s): Diana Hun; Richard Corsi; Maria Morandi; Jeffrey Siegel
Abstract: ABSTRACT: Attached garages have been identified as important sources of indoor residential air pollution. However, the literature lacks information on (1) how the proximity of cars to the living area affect indoor concentrations of gasoline-related compounds, such as benzene; and (2) the origin of these pollutants, i.e., vapor or tailpipe emissions. We analyzed data from the Relationships of Indoor, Outdoor, and Personal Air (RIOPA) study to evaluate indoor (Cin) and outdoor (Cout) concentrations for 114 residences with cars either in an attached garage, a detached garage or carport, or without cars. Results indicate that single-family detached homes with cars in attached garages were affected the most by parked vehicles, followed by homes with vehicles in carports. Concentrations in homes with cars in detached garages were similar to those in residences without cars. Low ventilation rates exacerbated Cin in homes with attached garages. In general, the contribution from gasoline-related sources to indoor benzene and MTBE concentrations appeared to have been dominated by car exhaust, or by a combination of tailpipe and gasoline vapor emissions. Residing in a home with an attached garage could lead to benzene exposure estimates that are an order of magnitude higher than exposures from commuting in a car in heavy traffic, with a risk of 17 excess cancers in a population of a million. Strategies to lower exposure to gasoline-related contaminants in homes include improving construction practices to prevent the infiltration of pollutants into the living quarters or incorporating detached garages. RELEVANCE: Attached garages are common sources of indoor air pollution in homes that can lead to long-term exposures to gasoline-related contaminants that have been associated with cancer, such as benzene. Our results indicate that house design can lessen these exposures; for example, homes with detached garages had relatively low indoor benzene concentrations. UNCERTAINTY: Analytical precision will be reported as the pooled coefficient of variation (CV) of replicate sample analyses. Measurement precision will be provided as the pooled CV of collocated sample concentrations. Additionally, method detection limits and the percentage of field measurements above these concentrations will also be reported.

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