Mass and chemical composition of size-segregated aerosols (PM1, PM2.5, PM10) over Athens, Greece: Local versus regional sources

Theodosi, C; Grivas, G; Zarmpas, P; Chaloulakou, A; Mihalopoulos, N

dc.contributor.author	Theodosi, C	en
dc.contributor.author	Grivas, G	en
dc.contributor.author	Zarmpas, P	en
dc.contributor.author	Chaloulakou, A	en
dc.contributor.author	Mihalopoulos, N	en
dc.date.accessioned	2014-03-01T02:02:25Z
dc.date.available	2014-03-01T02:02:25Z
dc.date.issued	2011	en
dc.identifier.issn	16807316	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29317
dc.subject.other	aerosol	en
dc.subject.other	aerosol composition	en
dc.subject.other	long range transport	en
dc.subject.other	particle size	en
dc.subject.other	point source	en
dc.subject.other	seasonal variation	en
dc.subject.other	size distribution	en
dc.subject.other	speciation (chemistry)	en
dc.subject.other	Athens [Attica]	en
dc.subject.other	Attica	en
dc.subject.other	Greece	en
dc.title	Mass and chemical composition of size-segregated aerosols (PM1, PM2.5, PM10) over Athens, Greece: Local versus regional sources	en
heal.type	journalArticle	en
heal.identifier.primary	10.5194/acp-11-11895-2011	en
heal.identifier.secondary	http://dx.doi.org/10.5194/acp-11-11895-2011	en
heal.publicationDate	2011	en
heal.abstract	To identify the relative contribution of local versus regional sources of particulate matter (PM) in the Greater Athens Area (GAA), simultaneous 24-h mass and chemical composition measurements of size segregated particulate matter (PM1, PM2.5 and PM10) were carried out from September 2005 to August 2006 at three locations: one urban (Goudi, Central Athens, ""GOU""), one suburban (Lykovrissi, Athens, ""LYK"") in the GAA and one at a regional background site (Finokalia, Crete, ""FKL""). The two stations in the GAA exceeded the EU-legislated PM10 limit values, both in terms of annual average (59.0 and 53.6 μg m-3 for Lykovrissi and Goudi, respectively) and of 24-h value. High levels of PM2.5 and PM1 were also found at both locations (23.5 and 18.6 for Lykovrissi, while 29.4 and 20.2 μg m-3 for Goudi, respectively). Significant correlations were observed between the same PM fractions at both GAA sites indicating important spatial homogeneity within GAA. During the warm season (April to September), the PM1 ratio between GAA and FKL ranged from 1.1 to 1.3. On the other hand this ratio was significantly higher (1.6-1.7) during the cold season (October to March) highlighting the role of long-range transport and local sources during the warm and cold seasons respectively. Regarding the coarse fraction no seasonal trend was observed for both GAA sites with their ratio (GAA site/FKL) being higher than 2 indicating significant contribution from local sources such as soil and/or road dust. Chemical speciation data showed that on a yearly basis, ionic and crustal mass represent up to 67-70% of the gravimetrically determined mass for PM10 samples in the GAA and 67% for PM1 samples in LYK. The unidentified mass might be attributed to organic matter (OM) and elemental carbon (EC), in agreement with the results reported by earlier studies in central Athens. At all sites, similar seasonal patterns were observed for nss-SO42-, a secondary compound, indicating significant contribution from regional sources in agreement with PM1 observations. The contribution of local sources at both GAA sites was also estimated by considering mass and chemical composition measurements at Finokalia as representative of the regional background. Particulate Organic Matter (POM) and EC, seemed to be the main contributor of the local PM mass within the GAA (up to 62% in PM1. Dust from local sources contributed also significantly to the local PM10 mass (up to 33%). © 2011 Author(s).	en
heal.journalName	Atmospheric Chemistry and Physics	en
dc.identifier.doi	10.5194/acp-11-11895-2011	en
dc.identifier.volume	11	en
dc.identifier.issue	22	en
dc.identifier.spage	11895	en
dc.identifier.epage	11911	en