Publicaciones 2011-2020

@article{RN219,
title = {Photochemical Ozone Pollution in the Valparaiso Region, Chile},
author = { R. Toro and C.S. Donoso and R.A. Seguel and R.G.E. Morales and M.A. Leiva},
url = {/brokenurl#<Go to ISI>://WOS:000332712300001},
doi = {10.1007/s11869-013-0218-7},
issn = {1873-9318},
year = {2014},
date = {2014-01-01},
journal = {Air Quality Atmosphere and Health},
volume = {7},
number = {1},
pages = {1-11},
abstract = {The Valparaiso Region is characterized by the presence of air sheds that modulate the general atmospheric circulation with local winds. The ozone concentration in the region increases from the west coast toward the mountainous area, where the concentrations of ozone precursors are lower. In this study, surface ozone (O-3), nitric oxide, nitrogen dioxide, nitrogen oxide (NO (x) ), and volatile organic compounds (VOCs) were measured at four sites, including two upwind urban sites (Via del Mar (VM) and Villa Alemana (VA)), an upwind suburban site (Quillota (QU)) and a downwind semirural site (Los Andes (LA)) during 01 March-07 April 2010. The purpose of this study is to improve our understanding of the photochemistry of ozone in urban and semirural areas of the Valparaiso Region and the transport of ozone pollution in downwind rural areas. The results show that, in the VM and VA sites, higher concentrations of ozone precursors, NO (x) , and VOCs, are observed in the early morning hours, which is related to emissions from vehicle traffic, while comparatively lower ozone precursor concentrations are observed in QU and LA. In contrast, higher ozone concentrations are found in LA and QU, and lower concentrations are found in VM and VA. VOC analysis was performed by gas chromatography, and the results show that the VOC composition in the studied sites is similar to and coincident with vehicle emissions. An ozone formation regime limited by VOCs is found in the area. The leading contributors to the ozone-forming potential were ethene, propene, xylene, and toluene, which are also anthropogenic species and account for more than 70 % of O-3 formation. Thus, benzenes-toluene-xylenes played the most important role in O-3 formation, followed by alkenes, alkanes, aromatic, biogenic, and alkynes during the study periods. The m-, p-xylene/ethylbenzene relation confirms the reception of aged air masses in LA. The results of the present study demonstrate that ozone pollution is a regional problem and that O-3 regional transport is associated with such pollution. Finally, the results indicate the need to adopt mitigating measures for ozone pollution that consider the reactivity characteristics of VOCs.},
keywords = {control emissions, environmental chemistry, episode, formation hydrocarbons, non-methane nox, organic-compounds, ozone ozone, pollution-urban potential, regional, strategy, tropospheric volatile},
pubstate = {published},
tppubtype = {article}
}

@article{RN159,
title = {A Five-Year Study of Particulate Matter (Pm2.5) and Cerebrovascular Diseases},
author = { M.A. Leiva and D.A. Santibanez and S. Ibarra and P. Matus and R. Seguel},
url = {/brokenurl#<Go to ISI>://WOS:000323807900001},
doi = {10.1016/j.envpol.2013.05.057},
issn = {0269-7491},
year = {2013},
date = {2013-01-01},
journal = {Environmental Pollution},
volume = {181},
pages = {1-6},
publisher = {2013 Elsevier Ltd.},
abstract = {Cerebrovascular accidents, or strokes, are the second leading cause of mortality and the leading cause of morbidity in both Chile and the rest of the world. However, the relationship between particulate matter pollution and strokes is not well characterized. The association between fine particle concentration and stroke admissions was studied. Data on hospital admissions due to cerebrovascular accidents were collected from the Ministry of Health. Air quality and meteorological data were taken from the Air Quality database of the Santiago Metropolitan Area. Santiago reported 33,624 stroke admissions between January 1, 2002 and December 30, 2006. PM2.5 concentration was markedly seasonal, increasing during the winter. This study found an association between PM2.5 exposure and hospital admissions for stroke; for every PM2.5 concentration increase of 10 mu g m(-3), the risk of emergency hospital admissions for cerebrovascular causes increased by 1.29% (95% CI 0.552%-2.03%).},
keywords = {ambient binomial cerebrovascular cities, daily disease, environmental chemistry, epidemiology, episode, hospital matter, mortality, negative particulate pm10 pollution, regression, santiago, visits},
pubstate = {published},
tppubtype = {article}
}