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Studying human exposure to vehicular emissions using computational fluid dynamics and an urban mobility simulator: The effect of sidewalk residence time, vehicular technologies and a traffic-calming device.
Sci Total Environ
October 2019
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, CDMX 04510, Mexico. Electronic address:
A computational system consisting of an urban mobility simulator, validated fluid dynamics and an integral exposure model, is proposed to obtain cyclist and pedestrian exposure to PM and NO. Pedestrian activities in the urban anthroposphere include walking and running. The computational experiments take place in a computer-generated urban canyon, subject to emissions from diesel and gasoline Euro 5 and Euro 6 vehicular technologies, in continuous and stop-and-go traffic scenarios, and three wind directions at two speeds.
View Article and Find Full Text PDFRadical containing combustion derived particulate matter enhance pulmonary Th17 inflammation via the aryl hydrocarbon receptor.
Part Fibre Toxicol
May 2018
Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN, 38103, USA.
Background: Pollutant particles containing environmentally persistent free radicals (EPFRs) are formed during many combustion processes (e.g. thermal remediation of hazardous wastes, diesel/gasoline combustion, wood smoke, cigarette smoke, etc.
View Article and Find Full Text PDFDiesel in the dock.
BMJ
October 2015
Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK.
Emission rates of regulated pollutants from current technology heavy-duty diesel and natural gas goods movement vehicles.
Environ Sci Technol
April 2015
§South Quality Air Quality Management District, Diamond Bar, California 91765, United States.
Chassis dynamometer emissions testing of 11 heavy-duty goods movement vehicles, including diesel, natural gas, and dual-fuel technology, compliant with US-EPA 2010 emissions standard were conducted. Results of the study show that three-way catalyst (TWC) equipped stoichiometric natural gas vehicles emit 96% lower NOx emissions as compared to selective catalytic reduction (SCR) equipped diesel vehicles. Characteristics of drayage truck vocation, represented by the near-dock and local drayage driving cycles, were linked to high NOx emissions from diesel vehicles equipped with a SCR.
View Article and Find Full Text PDFPotential air toxics hot spots in truck terminals and cabs.
Res Rep Health Eff Inst
December 2012
Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA.
Introduction: Hot spots are areas where concentrations of one or more air toxics--organic vapors or particulate matter (PM)--are expected to be elevated. The U.S.
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