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Determining temporal variations in nitrogen dioxide air quality in an urban area

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Determining temporal variations in nitrogen dioxide air quality in an urban area

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dc.contributor.author Capilla, Carmen es_ES
dc.date.accessioned 2015-05-19T11:24:37Z
dc.date.issued 2014
dc.identifier.issn 1743-7601
dc.identifier.uri http://hdl.handle.net/10251/50494
dc.description.abstract The assessment of temporal changes in air pollutants to evaluate reduction strategies has to be done while taking into account meteorological variability. In this paper, several years of nitrogen dioxide (NO2) hourly data are analyzed at two sampling sites in Valencia urban area (Spain). Nitric oxide (NO) hourly concentrations are used as an indicator of traffic emissions. The results show that annual levels of NO2 have exceeded the limit values within the Directive of the European Union, in three years of the studied period at one sampling station. The low-pass filter developed by Zurbenko and Kolmogorov is applied to split the logarithm of NO2 and NO hourly concentrations into long-term, seasonal and short-term components. Long-term components represent a small amount in the overall variability of air pollution data. Seasonal and short-term components mask the underlying relationship between NO2 and emissions if studied as a whole. The pollutant temporal components have to be studied separately due to their different physical and explanatory mechanisms. Meteorological effects are analyzed and removed from filtered pollutants time series using forward stepwise multiple regressions. The dependencies of urban NO2 on the corresponding vehicular emissions and relevant meteorological parameters are non-linear. The percentage of temporal variations of NO2 above 24 hours explained by candidate meteorological variables is 26.6% at P.Silla and 31.4% at Viveros. The joint evolution of the long-term components of NO2 and NO time series is analyzed. Long-term trend of hourly NO can explain 81.3 % of the total variance of long-term NO2 changes at one site, indication that traffic is a major factor in NO2 formation at this location. es_ES
dc.language Inglés es_ES
dc.publisher WIT Press es_ES
dc.relation.ispartof International Journal of Sustainable Development and Planning es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Air pollution es_ES
dc.subject Kolmogorov-Zurbenko filter es_ES
dc.subject Nitrogen dioxide es_ES
dc.subject Temporal variations es_ES
dc.subject Urban air quality es_ES
dc.subject.classification ESTADISTICA E INVESTIGACION OPERATIVA es_ES
dc.title Determining temporal variations in nitrogen dioxide air quality in an urban area es_ES
dc.type Artículo es_ES
dc.embargo.lift 10000-01-01
dc.embargo.terms forever es_ES
dc.identifier.doi 10.2495/SDP-V9-N3-327-336
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat es_ES
dc.description.bibliographicCitation Capilla, C. (2014). Determining temporal variations in nitrogen dioxide air quality in an urban area. International Journal of Sustainable Development and Planning. 9(3):327-336. doi:10.2495/SDP-V9-N3-327-336 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.2495/SDP-V9-N3-327-336 es_ES
dc.description.upvformatpinicio 327 es_ES
dc.description.upvformatpfin 336 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 9 es_ES
dc.description.issue 3 es_ES
dc.relation.senia 268429


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