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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/16173
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dc.contributor.authorHatzianastassiou, N.en
dc.contributor.authorKatsoulis, B. D.en
dc.contributor.authorAntakis, B.en
dc.date.accessioned2015-11-24T18:28:42Z-
dc.date.available2015-11-24T18:28:42Z-
dc.identifier.issn0167-6369-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/16173-
dc.rightsDefault Licence-
dc.subjectpatterns of air pollutionen
dc.subjectmeteorological conditionsen
dc.subjectnox center dot o-3 concentrationsen
dc.subjectepisodesen
dc.subjectlinear trendsen
dc.subjectair-pollutionen
dc.subjectgreeceen
dc.subjectqualityen
dc.subjectpollutantsen
dc.subjectmesoscaleen
dc.subjectweekendsen
dc.subjectepisodesen
dc.subjecttrendsen
dc.titleExtreme nitrogen oxide and ozone concentrations in athens atmosphere in relation to meteorological conditionsen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.primaryDOI 10.1007/s10661-006-9338-y-
heal.identifier.secondary<Go to ISI>://000246149900038-
heal.identifier.secondaryhttp://www.springerlink.com/content/3733267355788006/fulltext.pdf-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιώνel
heal.publicationDate2007-
heal.abstractIn the present study, we investigate the variation of NOx (NO + NO2) and O-3 concentrations and the relation between the extreme events (episodes) of NOx and O-3 concentrations and the relevant meteorological conditions in the urban atmosphere of the Athens basin. Hourly data of NO, NO2 and O-3 concentrations from 10 representative monitoring sites located in the Athens basin were used, covering the 10-year time period from 1994 to 2003. The results of our analysis show that the concentrations of air pollutants differ significantly from one monitoring site to another, due to the location and proximity of each station to the emission sources. For each site, there are also significant differences in NOx and O-3 concentrations from day to day, as well as from month to month and/or from season to season. The annual and seasonal variations show higher NO values in winter and lower in summer. On the contrary, NO2 and O-3 values are higher in summer (photochemical production of O-3) and lower in winter. These differences are attributed, to a large extent, to the prevailing synoptic and meteorological conditions, the most important between them being the wind direction and speed as well as the atmospheric pressure. Our analysis of the identified 179 extreme NOx air pollution events shows that most of them took place under anticyclonic conditions, associated with calm or weak winds (speed < 2.5 ms(-1)) of mostly southern to southwestern directions, as well as with low air temperatures and intense stable surface atmospheric conditions. There exists a significant decreasing tendency in NOx air pollution episodic events over the 10-year study period, resulting in very few to none events in the period from 2000 to 2003. As far as it concerns the extreme O-3 concentrations, 34 air pollution events were identified, occurring under high air temperatures, variable weak winds and intense solar irradiation. The trends of O-3 concentrations are stronger in suburban sites than in urban ones.en
heal.journalNameEnviron Monit Assessen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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