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Quantification of Sources of Variability of Air Pollutant Exposure Concentrations Among Selected Transportation Microenvironments

Frey, H. Christopher, Gadre, Disha, Singh, Sanjam and Kumar, Prashant (2020) Quantification of Sources of Variability of Air Pollutant Exposure Concentrations Among Selected Transportation Microenvironments Transportation Research Record. pp. 1-17.

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The National Research Council has identified the lack of sufficient microenvironmental air pollution exposure data as a significant barrier to quantification of human exposure to air pollution. Transportation microenvironments, including pedestrian, transit bus, car, and bicycle, can be associated with higher exposure concentrations than many other microenvironments. Data are lacking that provide a systematic basis for comparing exposure concentrations in these transportation modes that account for key sources of variability, such as time of day, season, and types of location along a route such as bus stops and intersections. The objectives of this work are to: quantify and compare PM2.5, CO, and O3 exposure concentrations in selected active and passive transportation microenvironments; and quantify the effect of season, time of day, and location with respect to variability in transportation mode exposure concentrations. Measurements were made with an instrumented backpack and were repeated for multiple days in each season to account for the impact of inter-run variability. Results include mean trends, spatial variability, and contribution to variance. Pedestrian and cycle mode exposure concentrations were approximately similar to each other and were substantially higher than for bus and car cabins for both PM2.5 and O3. Based on over 30 days of field measurements conducted over three seasons and for two times of day on weekdays, transportation modes and season were the largest contributors to variability in exposure for PM2.5 and O3, whereas location type alone and in combination with transport mode helped explain variability in CO exposures.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Frey, H. Christopher
Gadre, Disha
Singh, Sanjam
Date : 5 July 2020
Funders : University Global Partnership Network, NCSU Center for Human Health and the Environment
DOI : 10.1177/0361198120929336
Grant Title : NCSU Center for Human Health and the Environment
Copyright Disclaimer : c National Academy of Sciences: Transportation Research Board 2020
Uncontrolled Keywords : air pollution, exposure, health, particulate matter, ozone, carbon monoxide
Additional Information : Embargo OK Metadata OK
Depositing User : James Marshall
Date Deposited : 08 Jun 2020 15:55
Last Modified : 17 Jul 2020 15:53

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