Analysis of Summertime PM2.5 and haze in the Mid-Atlantic Region

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dc.contributor.authorChen, L.-W. Antony
dc.contributor.authorChow, Judith C.
dc.contributor.authorDoddridge, Bruce G.
dc.contributor.authorDickerson, Russell R.
dc.contributor.authorRyan, William F.
dc.contributor.authorMueller, Peter K.
dc.date.accessioned2009-03-05T17:32:46Z
dc.date.available2009-03-05T17:32:46Z
dc.date.issued2003
dc.description.abstractObservations of the mass and chemical composition of particles less than 2.5 µm in aerodynamic diameter (PM2.5), light extinction, and meteorology in the urban Baltimore-Washington corridor during July 1999 and July 2000 are presented and analyzed to study summertime haze formation in the mid-Atlantic region. The mass fraction of ammoniated sulfate (SO4^2-) and carbonaceous material in PM2.5 were each ~50% for cleaner air (PM2.5 < 10 µg/m3) but changed to ~60% and ~20%, respectively, for more polluted air (PM2.5 > 30 µg/m3). This signifies the role of SO4^2- in haze formation. Comparisons of data from this study with the Interagency Monitoring of Protected Visual Environments network suggest that SO4^2- is more regional than carbonaceous material and originates in part from upwind source regions. The light extinction coefficient is well correlated to PM2.5 mass plus water associated with inorganic salt, leading to a mass extinction efficiency of 7.6 ± 1.7 m2/g for hydrated aerosol. The most serious haze episode occurring between July 15 and 19, 1999, was characterized by westerly transport and recirculation slowing removal of pollutants. At the peak of this episode, 1-hr PM2.5 concentration reached ~45 µg/m3, visual range dropped to ~5 km, and aerosol water likely contributed to ~40% of the light extinction coefficient.en
dc.format.extent704717 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citationAnalysis of Summertime PM2.5 and haze in the Mid-Atlantic Region, L-W.A. Chen, B.G. Doddridge, J.C. Chow, R.R. Dickerson, W.F. Ryan, and P.K. Mueller; JAWMA, 53(8), 946-956, 2003.en
dc.identifier.urihttp://hdl.handle.net/1903/8950
dc.language.isoen_USen
dc.publisherAir & Waste Management Association (A&WMA)en
dc.relation.isAvailableAtCollege of Computer, Mathematical & Physical Sciencesen_us
dc.relation.isAvailableAtAtmospheric & Oceanic Scienceen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjecthaze formationen
dc.subjecthazeen
dc.subjectpollutionen
dc.subjectatmosphereen
dc.titleAnalysis of Summertime PM2.5 and haze in the Mid-Atlantic Regionen
dc.typeArticleen

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