@article{ref1,
title="Sidewalk pollution flows caused by vehicular traffic place children at a higher acute exposure risk",
journal="Journal of exposure science and environmental epidemiology",
year="2019",
author="Jazcilevich, Aron and de la Cruz Zavala, Juan and Erazo Arcos, Ayda Marcela and Kanda, Isao and Rosas, Irma",
volume="29",
number="4",
pages="491-499",
abstract="The objective of this work is to study the immediate transport flows of PM<sub>2.5</sub> diesel exhaust emissions on a city sidewalk. Under calm conditions largest direct exhaust PM<sub>2.5</sub> diesel concentrations tend to accumulate at two preferred heights: higher ones at 200-225 cm due to truck and buses aerodynamics, and lower ones at 130-160 cm due to light vehicles. Obtained flows indicate that exhaust emissions are transported to these heights via vortices generated by vehicular traffic. The lower height vortices transporting PM<sub>2.5</sub> direct diesel emissions place children aged between 7 and 15 at a higher acute exposure risk due to their stature. Also, the hourly averaged PM<sub>2.5</sub> concentrations tend to accumulate nearer to the roadside. This information was obtained using a specially designed electromechanical near-surface atmospheric profiler equipped with a PM<sub>2.5</sub> measurement instrument, a thermistor and a sonic anemometer installed on a sidewalk. Using signal analysis techniques, coherent flows of direct PM<sub>2.5</sub> emissions and thermal information were obtained. The proposed methodology can be used to evaluate before and after urban interventions, obtain full-scale sidewalk data for exposure studies and provides criteria on where to place sidewalk measurement instruments.<p /> <p>Language: en</p>",
language="en",
issn="1559-0631",
doi="10.1038/s41370-018-0083-4",
url="http://dx.doi.org/10.1038/s41370-018-0083-4"
}